What If Deku Had an Overpowered Parasaurolophus Quirk for Sonic Roar Shockwaves

 The world, Izuku Midoriya would learn at a very young age, was built on sound. 

It was built on the confident, booming laughter of the Number One Hero, All Might, emanating from computer monitors and television screens. It was built on the sharp, staccato pops of Katsuki Bakugo’s explosions in the sandbox, a sound that demanded attention and respect. It was built on the gentle, melodic hum of his mother, Inko, as she cooked dinner in their small apartment. 

Sound was connection. Sound was expression. Sound was power. 

But for Izuku, sound would become something entirely different. It would become a weapon. It would become a cage. 

It started on a Tuesday in early spring. The air was crisp, carrying the scent of cherry blossoms and the distant exhaust of Musutafu’s bustling morning traffic. Four-year-old Izuku sat in the neighborhood playground, a bright yellow All Might action figure clutched in his small, chubby hands. Beside him, Katsuki Bakugo was standing on the highest platform of the jungle gym, his palms facing outward as tiny, crackling sparks of caramel-scented light danced across his skin.

"See that, Zuku?!" Katsuki cheered, his red eyes wide with the thrill of his newly manifested Quirk. "I'm gonna be the best! Better than All Might! My explosions are gonna be huge!"

"That's so cool, Kacchan," Izuku said, his voice high and bright, untouched by the gravelly depth it would one day possess. "I wonder what my Quirk will be. I hope it’s something flashy like yours!"

Izuku had been feeling strange all morning. There was a deep, persistent itch at the back of his throat, right where his nasal cavity met his windpipe. It wasn't the scratchiness of a cold. It felt deeper, structural, as if his very bones were humming. His head felt heavy, a dull ache throbbing at the base of his skull. He rubbed the back of his head, his unruly mop of green hair doing little to soothe the bizarre pressure building beneath his scalp.

"Maybe you'll breathe fire like your dad," Katsuki suggested, hopping down from the jungle gym and landing in the sand with a soft thud. "Or maybe you can pull things like Auntie Inko. But whatever it is, it won't beat mine!"

"Yeah..." Izuku muttered, distracted. 

The pressure was mounting. It felt like a balloon was inflating inside his head, pushing against his skull. The itch in his throat cascaded down into his chest. His lungs suddenly felt too large for his ribcage. He took a breath, and the air seemed to whistle as it entered his body, sounding strangely hollow, like wind rushing through an empty cavern. 

"Hey, Deku, are you listening to me?" Katsuki frowned, marching over. "You look stupid. Your face is all red."

"I... I think I'm gonna sneeze," Izuku managed to squeak out. 

But the voice that came out of his mouth didn't sound like him. It was layered. Beneath his high-pitched childish treble was a strange, sub-audible rumble, a bass frequency that caused the sand at Katsuki's feet to vibrate slightly.

"Then sneeze, idiot," Katsuki said, crossing his arms. 

Izuku squeezed his eyes shut. His small chest expanded. And expanded. And kept expanding. 

To Katsuki’s horror, Izuku’s body began to change. The skin along Izuku’s neck rippled, shedding its smooth texture as tiny, emerald-green scales erupted along his throat. But the most terrifying change was happening to his head. 

With a sickening, wet crunch that made Katsuki stumble backward, the back of Izuku’s skull elongated. Bone and cartilage pushed backward in a matter of seconds, tearing through the skin and hair to form a massive, swept-back tubular crest, nearly as long as Izuku's entire torso. It was a pale, bony structure, laced with pulsing blue veins, glowing faintly with raw kinetic energy. 

Izuku’s mouth opened involuntarily, unhinging slightly. 

He didn't sneeze. 

He roared. 

The sound that erupted from the four-year-old was not a human sound. It was the primordial, terrifying call of an apex creature from sixty-five million years ago, amplified by human biology into a weapon of mass destruction. The crest on his head acted as a massive resonating chamber, taking the air from his expanded lungs and compressing it into a hyper-focused, low-frequency shockwave. 

BBBB-WUUUUUUUUUUUM!

It was a sonic boom. A physical wall of condensed air and sound ripped from Izuku’s mouth. 

The immediate area was instantly decimated. The sand in the playground was blasted outward in a perfect three-hundred-and-sixty-degree ripple, stripping the playground down to bare dirt. The heavy oak tree behind Katsuki didn't just snap; it was violently uprooted and hurled through the air like a twig. 

Katsuki himself was caught in the periphery of the blast. The sheer atmospheric pressure of the soundwave picked the explosive boy up and threw him violently into the metal slide. 

But the shockwave didn't stop at the park. 

It traveled outward into the residential street. Every window within a four-block radius—cars, apartments, storefronts, streetlamps—shattered simultaneously in a spectacular rain of crystalline glass. Car alarms wailed to life in a chaotic symphony, but their sirens were entirely drowned out by the lingering, deafening ringing that hung in the air. 

Izuku sat in the dirt, the massive, heavy crest pulling his head backward. His neck was sore. His chest was heaving. He opened his eyes, tears streaming down his face. 

The playground was gone. It looked like a bomb had gone off. 

"K-Kacchan?" Izuku whimpered. 

Katsuki lay in the dirt near the dented metal slide. He was conscious, his eyes wide with absolute terror. A thin trickle of blood leaked from his ears. He looked at Izuku—at the terrifying, scaled monster with the massive horn on his head—and his mouth moved, but no sound came out. Katsuki's eardrums had been completely overwhelmed. He was temporarily deaf. 

Izuku, realizing he had hurt his best friend, began to cry. 

But as he opened his mouth to sob, the air around him began to warp and distort again, the heavy bass frequency rumbling in his chest. A nearby stray cat hissed and fled as another miniature shockwave rippled through the dirt, cracking the pavement beneath Izuku’s small sneakers. 

He couldn't even cry without breaking the world around him. 

Ten Years Later.

The classroom of Aldera Junior High was loud. It was a cacophony of scraping chairs, chattering teenagers, and the occasional miniature Quirk activation as students showed off to one another. 

In the very back row, seated by the window, sat Izuku Midoriya. 

He was quiet. He was always quiet. 

At fourteen years old, Izuku cut a striking, intimidating figure. He had grown tall, his shoulders broad from years of carrying the physical weight of his own mutation. Sweeping back from his forehead, protruding proudly from the mess of his dark green curls, was his crest. It was a magnificent, hardened biological structure, measuring nearly two feet long, curving slightly downward at the end. It was armored, a deep, iridescent emerald green that matched his eyes, fading into a bone-white at the tip. Thick, armored scales covered the front of his throat and the back of his neck, protecting the hyper-developed vocal cords and massive tracheal tubes beneath. 

But the most notable thing about Izuku wasn't his dinosaur-like mutation. It was the muzzle. 

Strapped securely over the lower half of his face was a heavy, industrial-grade support item. It was made of reinforced carbon-fiber and lined with advanced, sound-dampening acoustic foam—the kind used in deep-sea submarines and aerospace testing facilities. It locked behind his neck with a thick magnetic clasp, secured over his ears to protect his own hearing. A small, reinforced mesh grate at the front allowed him to breathe, but it was heavily baffled. 

He looked like a dangerous criminal. He looked like a beast kept on a leash. 

The truth was, he had chosen to wear it. 

Following the "Playground Incident," as the local news had called it, Izuku’s life had fractured. The doctors had identified his Quirk as a massive genetic throwback combined with a potent Emitter mutation. They called it Parasaur. Izuku possessed the physiological traits of a Parasaurolophus, specifically the complex cranial crest and massive lung capacity, but supercharged by the Emitter gene. His vocal cords could produce sound waves capable of leveling city blocks. 

The government had classified his Quirk as a Class-A Hazard. Without immense control, a simple sneeze, cough, or shout from Izuku could liquefy human organs, shatter structural foundations, or cause permanent deafness to anyone within a hundred yards. 

The guilt of almost killing Kacchan and destroying a neighborhood had fundamentally broken something in four-year-old Izuku. He developed acute phonophobia—the fear of his own voice. For the first two years after his Quirk manifested, he refused to speak. If he felt a cough coming on, he would panic, nearly suffocating himself by holding his breath until he passed out. 

The muzzle was prescribed when he was six. It was a government-mandated safety measure, but to Izuku, it was a lifeline. It was a physical barrier that promised him he wouldn't hurt anyone ever again. 

"Alright, settle down, settle down!" the homeroom teacher announced, slapping a stack of papers against his desk. The noise in the classroom died down. "You're all third-years now. It's time to start thinking seriously about your futures. I'm going to pass out these career aptitude tests, but..." 

The teacher smirked, grabbing the stack of papers and tossing them over his shoulder. They fluttered into the air like snow. "Why bother? I know you all want to go to the Hero Track!"

The classroom erupted. Quirks flashed—elongated fingers, small bursts of water, glowing skin. 

"Yes, yes, you all have wonderful Quirks," the teacher sighed, waving his hands. "But remember, no Quirk usage in school! Now, let's see... Oh, Bakugo. You're aiming for U.A. High, aren't you?"

The murmurs in the classroom instantly hushed. 

Katsuki Bakugo sat leaning back in his chair, his feet resting casually on his desk. He looked older, sharper, his spiky ash-blond hair perfectly framing his aggressive red eyes. "Don't lump me in with these rejects, teach," Bakugo scoffed, a feral grin spreading across his face. "I'm not aiming for U.A. I'm already accepted. I aced the mock tests. I'm the only one from this garbage middle school who has what it takes to be a top-tier Pro."

"Oh, right," the teacher said, looking down at his clipboard. "Midoriya is also applying for U.A., isn't he?"

The silence that fell over the room was absolute. 

Every single head turned to the back corner of the room. They looked at the boy with the massive crested head and the heavy metal muzzle. 

Izuku didn't flinch. He didn't cower. He just sat there, his emerald eyes calmly observing the chalkboard. He slowly reached up, his large, calloused hand adjusting the leather strap of his muzzle. 

No one laughed. 

If Izuku had been Quirkless, they would have mocked him. They would have thrown things, called him a dreamer, a loser, a Deku. But they knew what was underneath that muzzle. They had all heard the stories. They had all seen the shockwave dents in the walls of the gymnasium from when Izuku had accidentally tripped in his first year and let out a muffled gasp. 

They weren't mocking him. They were terrified of him. 

"Midoriya?" a student whispered in the front row. "U.A.? I mean... his Quirk is villainous, but the raw power..."

"He's gonna kill someone in the exams," another muttered. 

SLAM!

Bakugo’s palm hit his desk, a localized explosion turning the wood to charred splinters. He stood up, his chair clattering to the floor. His eyes were locked on Izuku, burning with a complex, furious fire. 

"Deku," Bakugo growled, the name dripping with venom. 

Izuku slowly turned his head. His crest shifted, the scales on his neck rippling. He looked at Bakugo. He didn't speak. He couldn't. Instead, Izuku raised his hands, his fingers moving in swift, practiced motions. Sign language. 

[What is it, Kacchan?]

"Don't you give me those damn hand signs!" Bakugo roared, marching down the aisle. The other students scrambled out of his way. "You think you're better than me?! You think you can just waltz into U.A. without even opening your mouth? You think you can just sit there, looking down on me from behind that stupid metal cage?!"

Izuku’s eyes softened with a familiar, weary sadness. He signed again, his movements fluid and deliberate. 

[I am not looking down on you. I want to be a hero. Just like you.]

"You're a walking natural disaster!" Bakugo shouted, stopping mere inches from Izuku’s desk. Sparks flew from his clenched fists, popping violently in the quiet room. "A hero controls their power! You’re too much of a coward to even use yours! If you show up at U.A., I'll blow that overgrown horn right off your skull! Do you hear me?!"

Izuku stared at Bakugo. The relationship between them was shattered beyond repair, deformed into a toxic, twisted rivalry. Bakugo hated Izuku not because Izuku was weak, but because Izuku possessed a power so god-like, so destructive, that it made Bakugo’s explosions look like firecrackers. Bakugo felt insulted that Izuku held himself back. He viewed Izuku’s muzzle as the ultimate insult—a proclamation that Izuku didn't even need to use his power to share the same space as Bakugo. 

Izuku reached into his desk and pulled out a heavily burnt, water-logged notebook. On the cover, written in sharpie, were the words: Hero Analysis for the Future. Vol. 13.

He tapped the cover, then pointed to Bakugo, then to himself. 

[We will see.] 

Bakugo sneered, turning away in disgust. "Keep living in your silent little world, Deku. The real world is going to tear you apart."

When the bell rang, signaling the end of the school day, the classroom emptied rapidly. No one wanted to be the last one in the room with the crested boy. Izuku packed his bag methodically, sliding his notebook into the main pocket. 

He walked out of the school gates alone, taking the long way home. He preferred the longer route. It took him past the commercial district, under a wide overpass, and near the bustling center of the city. He liked to observe the Pro Heroes at work. 

Despite his terrifying Quirk, Izuku was a hero fanboy down to his marrow. He had spent his entire life analyzing Quirks, calculating limitations, and studying physics. If he couldn't use his Quirk freely, he had decided long ago that he would become the smartest tactical mind in the field. He understood the complex mathematics of shockwaves, resonance frequencies, structural integrity, and acoustics better than most university professors. 

As he walked, his muffled breathing echoed softly inside his mask. Hsss. Haa. Hsss. Haa. The heavy foam pressed comfortably against his cheeks. 

He was pulled from his thoughts by a sudden, violent tremor beneath his feet. 

It wasn't a sound, but a physical vibration in the concrete. Izuku’s mutated biology made him incredibly sensitive to vibrations. He paused, his emerald eyes narrowing as he scanned the horizon. A thick plume of black smoke was rising from the Tatooin Shopping District, only a few blocks away. 

Without hesitating, Izuku broke into a sprint. His long legs, thickened by years of carrying his top-heavy frame, propelled him forward at astonishing speed. 

When he arrived at the scene, chaos had already taken over. A massive crowd of onlookers had formed a semicircle around an alleyway. Police had set up a barricade, shouting for civilians to stay back. The heat in the air was stifling, smelling heavily of burning trash, ozone, and raw sewage. 

Izuku pushed his way to the front of the crowd, his large frame and intimidating appearance causing people to instinctively part for him. 

His breath hitched behind his muzzle. 

In the center of the flaming alleyway was a monster. It was a massive, undulating mass of dark green, viscous sludge. It had bulbous, crazed eyes and a jagged, gaping mouth. It was completely liquid, shifting and roiling as it wreaked havoc, throwing tentacles of slime to smash into the surrounding storefronts. 

Several Pro Heroes were on the scene. Death Arms was smashing his fists together, looking frustrated. Kamui Woods was attempting to launch his wooden branches, but the raging fires surrounding the villain forced him to retreat. Mt. Lady was standing at the entrance of the alley, unable to squeeze her giant form into the narrow space. 

"It's no good!" Death Arms shouted, coughing on the smoke. "I can't get a grip on this guy! He's too slippery, and the fires are spreading!"

"We have to wait for someone with a suitable Quirk!" Kamui Woods yelled back. "Where is the fire department?!"

Izuku’s eyes scanned the villain, analyzing its composition. Fluid dynamics. High viscosity. Weak point seems to be the eyes. But wait... what is it holding?

The sludge villain shifted, and the flames illuminated the center of its muddy mass. 

Izuku’s heart stopped. 

Trapped inside the suffocating sludge, struggling violently for breath, was a teenager with spiky ash-blond hair. Katsuki Bakugo. 

Bakugo’s face was purple. His eyes were wide with a primal, suffocating panic. His hands were extended outward, desperately firing off massive explosions in an attempt to blast himself free, but the explosions were only feeding the fires around them, doing nothing to the liquid villain. 

"He's got a hostage!" a civilian screamed. 

"His Quirk is too strong! The kid is going to kill us all with those explosions!" Death Arms growled, holding his arms up to shield his face from a stray blast. "We just have to hold out until a hero with a water or wind Quirk arrives!"

Hold out? Izuku thought, his mind racing. Kacchan can't breathe. The sludge is entering his lungs. He doesn't have time. He has maybe forty-five seconds before irreversible brain damage occurs from hypoxia. Why aren't they doing anything?!

Izuku looked around. The heroes were standing there. The police were standing there. Everyone was waiting. Everyone was watching a fourteen-year-old boy drown in the middle of a city street. 

Bakugo’s explosions grew weaker. His eyes rolled back slightly. He looked through the crowd. Through the smoke and the fire, Bakugo's desperate, fading gaze met Izuku's. 

It was a look of pure, unadulterated fear. It was a plea. 

Before Izuku’s conscious mind could even process the decision, his body moved. 

He didn't think about the laws. He didn't think about his muzzle. He didn't think about the danger. He just ran. 

"Hey! Kid! What are you doing?!" Death Arms shouted, reaching out to grab him, but Izuku slipped past the hero's grasp, vaulting over the police barricade and charging straight into the inferno. 

"Deku?!" Bakugo gurgled through the slime, his eyes widening in shock as he saw the boy sprinting toward him. 

What am I doing?! Izuku’s internal monologue screamed in terror. I can't punch it! I don't have super strength! My Quirk... I can't use my Quirk! I'll kill Kacchan! I'll level the entire block! 

The Sludge Villain laughed, a wet, bubbling sound. "Another piece of meat? You want to die with your friend, freak?!" A massive tentacle of sludge whipped out, aiming directly for Izuku’s chest. 

Izuku slid on his knees, dodging the tentacle. The heat of the fire licked at his school uniform. He stopped ten feet away from the villain. 

He looked at Bakugo. He looked at the sludge. 

No, Izuku thought, his mind achieving a state of absolute, hyper-focused clarity. I won't kill him. Sound is a wave. It requires a medium. The sludge is denser than air. If I hit the sludge directly, the kinetic transfer will blow Kacchan apart. But... if I aim precisely. If I alter the frequency. High frequency for localized disruption, low frequency for concussive force. If I aim just over his head, the differential pressure will create a vacuum, ripping the fluid outward.

It required a level of calculation and control Izuku had never attempted outside of theory. But he had to try. He was the only one here. 

Izuku reached up behind his head. 

His fingers found the heavy magnetic lock of his muzzle. 

Click. 

The lock disengaged. 

For the first time in eight years in public, Izuku Midoriya pulled the heavy metal apparatus away from his face and let it drop to the scorched concrete. The metal clattered against the ground. 

Izuku took a breath. 

It wasn't a normal breath. It was a biological event. 

The air in the alleyway literally rushed toward him, starving the surrounding fires of oxygen for a fraction of a second. The flames flickered and died down. Izuku’s chest expanded to nearly twice its normal size, his ribcage cracking and shifting as his massive lungs filled to maximum capacity. The emerald scales along his throat flared outward, locking together like armor plating to reinforce his windpipe. 

His crest began to glow. A deep, pulsing, ethereal blue light raced up the bony horn, humming with a frequency that made the very air warp and distort. The ground beneath Izuku’s feet began to crack, chunks of asphalt floating upward, defying gravity as the intense vibrational energy altered the local pressure field. 

The Sludge Villain froze, suddenly sensing an overwhelming, primal danger. "What... what the hell are you?!" 

Izuku locked his eyes on the space exactly two inches above Bakugo’s left shoulder. He tightened his diaphragm. He manipulated his vocal cords, restricting the airway to a millimeter of space, forcing the compressed air into the cranial crest to multiply the amplitude. 

Izuku opened his mouth. 

"ROOOOOOOOOOOOOOOOOOOOOOAAAAAAAAAAAAR!"

It wasn't a shout. It was a localized hurricane. 

A visible, translucent ring of distorted air erupted from Izuku’s mouth, traveling at the speed of sound. The sheer decibel level—easily surpassing 180 decibels—shattered every remaining window in a five-block radius, raining glass down on the screaming crowd who instantly covered their ears in agony. 

The shockwave hit the Sludge Villain. 

The effect was instantaneous and devastating. The concussive force didn't just push the villain; it atomized him. The high-frequency vibration ripped the molecular bonds of the sludge apart, turning the dense liquid into a fine, misty vapor in a millisecond. 

Because Izuku had aimed precisely above Bakugo, creating a slipstream vacuum, the boy was entirely spared from the blunt-force trauma of the blast. Instead, the vacuum forcefully sucked the remaining sludge out of Bakugo’s lungs and nose, violently expelling it into the atmosphere. 

The sonic blast continued down the alleyway, ripping the brick facing off the buildings on either side, entirely blowing out the fires like a birthday candle, and carving a massive trench into the concrete all the way down to the next street over. The sound echoed through the city like a thunderclap, setting off car alarms for miles. 

Silence descended on the alley. The only sound was the raining of debris and the distant wail of sirens. 

Bakugo fell to his knees, gasping violently for air, hacking up tiny droplets of dirty water. He was entirely free. The villain was gone, reduced to microscopic droplets scattered across the pavement. 

Izuku stood there for a moment, his chest heaving. Smoke literally drifted from his open mouth, his vocal cords scorched from the sheer friction of the sonic blast. His crest slowly dimmed, the blue light fading. 

He looked at Bakugo, ensuring the boy was breathing. Then, his eyes rolled back, and he collapsed onto the rubble, his exhausted body unable to handle the sudden depressurization. 

When Izuku awoke, his ears were ringing. He was sitting on the back bumper of an ambulance, a paramedic checking his vitals. He looked down and immediately panicked. 

His muzzle was missing. 

He frantically patted his face, his breathing hitching. He looked around wildly. 

"Easy, kid, easy," a gruff voice said. Death Arms stepped forward, holding the heavy carbon-fiber muzzle in his hands. He handed it to Izuku. 

Izuku snatched it immediately, snapping it around his neck and locking it into place. The moment the foam pressed against his skin, his panic subsided. He closed his eyes, taking deep, muffled breaths. 

"That was the most reckless, idiotic, suicidal thing I have ever seen in my career," Death Arms scolded, crossing his massive arms. Kamui Woods nodded in agreement beside him. "You broke Quirk laws. You interfered with an active hostage situation. You could have killed that boy! You could have brought those buildings down on all our heads!"

Izuku hung his head. He knew. He knew all of it. He was a monster who had let off a bomb in the middle of a city. He waited for the police to come and handcuff him. 

"However," a new voice boomed, cutting through the reprimands like a hot knife through butter. 

The crowd parted. Stepping into the alleyway, his massive frame casting a shadow over the Pro Heroes, was a man Izuku recognized instantly. The blonde hair swept up into two massive "V"s. The impossibly wide smile. The sheer, radiating aura of peace and strength. 

All Might. 

The Number One Hero had arrived, though apparently, he was too late for the fight. 

All Might walked past Death Arms, waving him off. "Stand down, heroes. The boy did what none of us had the courage to do."

Death Arms scoffed. "All Might, with all due respect, his Quirk is a Class-A Hazard. The collateral damage—"

"Was zero," All Might interrupted, his blue eyes flashing intensely. He pointed to the alleyway. The brick facades were stripped, yes. The windows were gone, yes. "Look closely, Death Arms. Structural pillars are intact. No load-bearing walls were compromised. The villain was neutralized without a single casualty. That wasn't a wild blast. That was surgical precision."

Izuku stared at All Might, his jaw dropping behind his muzzle. 

All Might turned his massive gaze down to Izuku. The hero’s smile softened slightly. "Young man. What is your name?"

Izuku raised his trembling hands. 

[Midoriya. Izuku Midoriya.]

All Might frowned slightly, looking at the muzzle, then at the boy's hands. "You do not speak?"

Izuku shook his head vigorously. He pointed to his crest, then mimed an explosion with his hands, crossing his arms in an 'X' to signify danger. 

"I see," All Might murmured. He stepped closer, kneeling down so he was eye-level with the crested teenager. "Young Midoriya. I was watching from the crowd. I was... not myself, and I hesitated. I stood there, a hypocrite, watching a boy die because I felt I lacked the power in that moment to save him." 

Izuku’s eyes widened. All Might? Lacking power? It was impossible. 

"But you," All Might continued, placing a massive, warm hand on Izuku’s shoulder. "With a Quirk that clearly terrifies you. With a power society has told you to lock away. You threw away your safety net to save a life. You moved when the professionals stood still."

A short distance away, being checked by another paramedic, Bakugo was watching the exchange. His face was unreadable, a complex mixture of fury, humiliation, and something else—perhaps awe. 

"Young Midoriya," All Might said, his voice dropping an octave, carrying a weight that seemed to vibrate in Izuku’s very soul. "A true hero is not defined by the nature of their Quirk, but by the nature of their heart. It is true, your power is devastating. It is a force of nature. But forces of nature can be harnessed. They can protect."

Tears welled up in Izuku’s eyes. They spilled over his cheeks, soaking into the foam of his muzzle. For ten years, he had been told his voice was a weapon, a curse, a villain's tool. He had been muzzled like a rabid dog. 

"I have been looking for a successor," All Might said quietly, so only Izuku could hear. "But perhaps... the world does not need another me right now. Perhaps, the world needs someone who can shatter the sky to clear away the clouds."

All Might stood up, standing at his full, imposing height. He pointed a finger directly at Izuku’s chest. 

"Izuku Midoriya. You can become a hero. And if you are willing to endure hell to learn control... I will personally teach you how to use your voice to save the world."

Izuku broke. He slid off the bumper of the ambulance, falling to his knees on the concrete. He bowed his head, his massive crest touching the ground. He grabbed the dirt with his hands, sobbing violently. 

His cries were completely muffled by the mask, rendering his agonizing, beautiful relief entirely silent to the world. But as he wept, the crest on his head glowed a soft, warm blue, pulsing gently in time with his heartbeat. 

It was the first time in ten years he hadn't felt like a monster. 

He was going to be a hero. He was going to find his voice.

The ocean breeze at Dagobah Municipal Beach Park smelled of salt, rust, and forgotten things. For years, the shoreline had been a dumping ground for Musutafu’s unwanted garbage—mountains of broken refrigerators, twisted cars, shattered glass, and rotting tires piled high against the horizon, completely obscuring the sea. 

It was a place of ruin. It was the perfect place to make a monster into a hero. 

Izuku Midoriya stood ankle-deep in the sand, staring at a towering stack of crushed sedans and rusted washing machines. The heavy carbon-fiber muzzle was secured tightly around his jaw, but his breathing was ragged, his chest heaving with exertion. 

"Again, Young Midoriya!" 

The voice belonged to Toshinori Yagi, though the world knew him as the invincible All Might. At the moment, however, Toshinori was not the towering, muscular symbol of peace. He was in his true form—gaunt, skeletal, his clothes hanging loosely off his emaciated frame. He sat on a relatively clean microwave, holding a stopwatch in one hand and a decibel meter in the other. 

When All Might had first offered to train Izuku, the boy had assumed it would be physical combat training. He had spent his life analyzing Pro Heroes, assuming the path to U.A. involved learning how to throw a punch or take a hit. 

But Toshinori had surprised him. “I could pass my Quirk, One For All, down to you,” Toshinori had explained on their first day at the beach, blood leaking slightly from the corner of his mouth. “But your body is already burdened by a localized weapon of mass destruction. Your biology is intrinsically tied to your mutation. If I gave you my stockpiled power, your next shout wouldn't just shatter windows; it would likely tear your own throat apart and level the city. No, Young Midoriya. You do not need my power. You need my discipline.”

And so, the training began. It wasn't about building muscle to punch harder, though dragging the heavy trash across the beach to clear the shoreline certainly built Izuku’s physique. The real training was about the breath. 

"Focus the aperture of your throat!" Toshinori called out, pointing a bony finger at the stack of cars. "Sound is a wave, but it is also pressure! When you yell, you open your vocal cords wide, creating a shotgun blast of kinetic energy. It spreads outward, losing velocity but covering a massive area. That is a villain’s attack! A hero must be precise! You must turn the shotgun into a sniper rifle!"

Izuku nodded slowly. He reached up, his calloused fingers finding the magnetic clasp of his muzzle. With a heavy click, he pulled it away. 

The cool morning air hit his face. Even now, taking the muzzle off sent a spike of primal anxiety through his heart. He felt naked. He felt dangerous. 

"Control your heart rate," Toshinori instructed gently. "If you panic, your diaphragm spasms. If your diaphragm spasms, the air escapes unevenly. You control the sound; the sound does not control you."

Izuku closed his eyes. He visualized the anatomy of his own throat—a complex, mutated array of reinforced cartilage, hyper-elastic vocal cords, and the massive, hollow bony crest extending from the back of his skull. The crest was a biological resonance chamber. Air from his lungs traveled up, through the vocal cords, into the crest where the sound waves bounced, amplified, and gathered kinetic mass, before being expelled through his mouth. 

He didn't need to yell. Yelling was a waste of energy. 

Izuku tightened his abdominal muscles. His massive lungs, easily three times the capacity of a normal human's, drew in the salty air. His chest expanded visibly, the fabric of his white t-shirt stretching taut. The thick, emerald-green scales that ran down his throat and neck flared slightly, interlocking like armor plating to brace against the impending internal pressure. 

Focus, Izuku thought. Don't let the wave spread. Channel it. Compress it.

He restricted his vocal cords, leaving only a microscopic gap for the air to escape. He tilted his head down, aiming his mouth directly at a rusted microwave balanced on the hood of a crushed sedan fifty feet away. 

He didn't roar. He clicked his tongue and forced a sharp, high-pressure exhale. 

CH-THOOM!

The sound was not deafening, but it was incredibly sharp, like the crack of a high-caliber sniper rifle. A visible, baseball-sized distortion in the air shot forward from Izuku’s mouth. It tore through the fifty feet of empty space in a fraction of a millisecond. 

It struck the microwave dead center. 

The heavy metal appliance didn't just fall backward; a perfect, circular hole was instantly punched clean through its front door and back panel, the sheer kinetic pressure shearing the metal away before the object even had time to register the momentum. A second later, the microwave imploded, collapsing inward on the vacuum created by the sonic bullet, and fell off the car. 

Izuku gasped, dropping to one knee. He clutched his throat, coughing violently. The friction of pushing compressed air through such a tight space felt like swallowing burning sandpaper. 

"Excellent!" Toshinori cheered, checking the decibel meter. "Only 110 decibels! Loud, yes, but well below the threshold of permanent hearing damage for bystanders. And the localized kinetic force was astounding! You pierced steel with air, Young Midoriya!"

Izuku looked up, smiling weakly as he slipped the muzzle back over his face. He signed quickly, his fingers moving in practiced motions. 

[It burns. I can only do that three, maybe four times before my vocal cords swell shut.]

"That is a limitation we will have to accept for now," Toshinori said, walking over and handing Izuku a thermos of warm tea with honey. "Your Quirk is inherently destructive. Forcing it to be surgical requires immense friction. Over time, your internal biology will callous and adapt. But look around you, my boy."

Izuku stood up, taking the thermos and looking down the shoreline. 

When they had started ten months ago, the beach was entirely covered in trash. Now, as the sun rose over the horizon, painting the sky in vibrant strokes of orange and pink, the beach was pristine. Miles of golden sand stretched out before them, kissed by the gentle foaming waves of the ocean. 

Izuku had cleared it. He had dragged the heavy items by hand to build his physical endurance, and he had used his sonic blasts to safely break down the larger, unmovable structures into manageable scrap. In doing so, his body had transformed. 

He was no longer the soft, anxious boy who sat quietly in the back of the classroom. At fifteen, Izuku was heavily muscled, his core immensely developed to support the explosive power of his diaphragm. His legs were thick and powerful, a side effect of his saurian mutation. The scales on his neck were vibrant and hard as diamonds, and his cranial crest had grown slightly, sweeping majestically back from his dark green curls, glowing faintly with latent kinetic energy. 

"You have done well, Young Midoriya," Toshinori said, his hollow eyes softening with profound pride. "You have taken a power meant for devastation and learned the art of restraint. You have built a vessel worthy of a hero. Today is the U.A. Entrance Exam. Are you ready?"

Izuku looked out at the ocean. He listened to the rhythmic, soothing sound of the waves crashing against the shore. Sound wasn't just destruction. Sound was the ocean. Sound was a heartbeat. 

He tightened the straps of his muzzle. He turned to his mentor, and gave a sharp, resolute nod. 

The gates of U.A. High School were massive, a towering testament to the prestige and grandeur of Japan’s premier hero academy. Hundreds of hopeful students swarmed the entrance, a vibrant sea of unique Quirks, colorful hair, and nervous energy. 

Izuku walked among them, instantly parting the crowd like Moses at the Red Sea. 

Despite his best efforts to blend in, it was impossible. He stood a head taller than most of the applicants, his broad shoulders and thick neck giving him the silhouette of a seasoned Pro. The massive, swept-back crest protruding from his skull caught the morning sunlight, the bone-white tip gleaming. 

But it was the muzzle that truly drew their stares. 

It was a new model, custom-ordered by Toshinori through a specialized support company. It was sleeker than his old industrial one, made of lightweight, gunmetal-grey titanium and lined with advanced kinetic-absorbing gel. It covered his jaw and nose, locking securely behind his ears. It looked less like a medical restraint and more like tactical combat gear, but the message it sent to the other students was exactly the same: Whatever comes out of this guy’s mouth is too dangerous to be let out.

Whispers erupted as he walked up the main path. 

"Look at that guy... is he a villain?"

"That mutation is intense. Is it a dinosaur?"

"Why is he wearing a muzzle? Did he bite someone?"

Izuku kept his eyes forward, ignoring the murmurs. He was used to it. He adjusted the straps of his heavy backpack and continued walking, his mind focused entirely on the upcoming written exam. 

"Out of my way, Deku!" 

Izuku paused. He didn't need to turn around to recognize the aggressive, popping sound of Katsuki Bakugo’s palms, nor the vitriol in his voice. 

Bakugo marched up behind him, his hands shoved deep into his pockets, his red eyes glaring daggers at Izuku’s back. The two hadn't spoken since the Sludge Villain incident ten months ago. Bakugo had entirely isolated himself, throwing all of his explosive rage into his own training. Seeing Izuku—seeing how much larger, how much more imposing the "muzzled freak" had become—only fueled Bakugo’s fierce inferiority complex. 

"Don't think you can stand in my way just because you got a fancy new dog mask," Bakugo sneered, stopping beside Izuku. "I don't know what you've been doing for the last ten months, but you're still a coward who's afraid of his own shadow. I'm going to crush this exam, and I'm going to crush you."

Izuku looked down at Bakugo. There was no fear in Izuku’s emerald eyes anymore. Only a calm, quiet understanding. Izuku didn't use sign language. He didn't need to. He simply offered Bakugo a slow, respectful nod, acknowledging the challenge, before stepping aside to let the explosive boy pass. 

Bakugo clicked his tongue in irritation, storming off toward the main building. 

Izuku let out a soft, muffled sigh through his mask and took a step forward—

And immediately tripped over his own massive, heavy feet. 

His saurian center of gravity was heavily biased toward his upper body and crest. A simple misstep on a loose paving stone sent him tumbling forward. He braced himself for the embarrassing impact of titanium against concrete, but the impact never came. 

He was floating. 

"Oops! Are you okay?" 

Izuku blinked, finding himself suspended in mid-air, an inch above the ground. He looked over to see a girl with a round face, rosy cheeks, and short brown hair standing beside him, her fingers pressed together. 

"Sorry I used my Quirk on you without asking," she said, offering a bright, warm smile. "But it would be bad luck if you fell right before the exam, right?" 

She pressed her hands together, and gravity instantly reasserted itself. Izuku dropped the remaining inch to the ground, easily catching his balance. He stared at the girl, his heart doing a strange, fluttering rhythm that had absolutely nothing to do with resonance frequencies. 

"I'm Ochaco Uraraka!" she chirped. She looked at his crest, her eyes widening in genuine wonder, not fear. "Wow, your mutation is so cool! Are you a dinosaur type? That horn looks really heavy!"

Izuku was entirely unprepared for this. People didn't usually talk to him, let alone compliment his mutation. He fumbled, quickly raising his hands to sign a greeting, before realizing she likely didn't understand Japanese Sign Language. 

He reached to his left wrist, where he wore a thick, digital bracer—another gift from Toshinori. He typed rapidly on the small keypad with his thumb. A robotic, perfectly modulated voice emitted from the bracer's speaker. 

[Thank you. I am Izuku Midoriya. Your anti-gravity Quirk is incredibly versatile. It is a pleasure to meet you.]

Uraraka blinked, looking at the bracer, then up to his muzzled face. "Oh! You use a synthesizer! That's so neat! Well, Midoriya, let's both do our best today!" She gave him a cheerful wave and jogged off toward the entrance. 

Izuku stood there for a moment, his hand resting over his heart. I talked to a girl, he thought, his eyes wide. Well, my wrist talked to a girl. It counts!

The auditorium was massive, packed with thousands of hopeful applicants. Izuku sat near the middle, his massive crest forcing the student behind him to lean slightly to the side to see the stage. 

The lights dimmed, and a spotlight snapped onto the center podium. 

"WHAT'S UP, U.A. CANDIDATES?!" 

The Voice Hero, Present Mic, struck a dynamic pose, his blonde hair defying gravity, his directional speaker mustache twitching with excitement. "CAN I GET A 'YEAH'?!"

Absolute silence greeted him. 

"Wow, tough crowd!" Present Mic laughed, completely unfazed. "Alright, listeners, let me lay down the beat for how this practical exam is gonna go! You'll be conducting a ten-minute mock urban battle in specially designed training cities!" 

As Present Mic explained the rules—the destruction of three different types of robotic villains for varying points—Izuku leaned forward, his analytical mind already whirring. It's a straightforward combat exercise. Physical Quirks and destructive Emitters will have a massive advantage. Stealth and Support Quirks are at a severe disadvantage. The goal is raw accumulation.

Suddenly, Present Mic paused his presentation, his eyes scanning the crowd. Behind his orange sunglasses, his gaze locked onto Izuku. As a hero whose entire fighting style and identity revolved around acoustics, Present Mic was intimately familiar with sound-based Quirks. He immediately recognized the biological structure of Izuku’s head. 

A Parasaurolophus mutation? Present Mic thought, his internal monologue geeking out. That crest is a natural resonance chamber. The volume that kid could produce... wait, is that a military-grade acoustic suppression muzzle? Holy smokes, the decibel output on this kid must be catastrophic.

Present Mic cleared his throat, forcing his attention back to the presentation. "Now, we have three types of faux villains! But wait!" 

A tall, broad-shouldered boy with glasses suddenly stood up from the front row, his hand shooting into the air with robotic stiffness. "Excuse me, sir! I have a question!"

"Hit me, listener!"

"The pamphlet lists four types of villains, not three!" the boy said, his voice loud and authoritative. "If this is a misprint, U.A. should be ashamed of such a blatant error! Furthermore!" The boy turned around, pointing directly at Izuku. "You, with the large mutation and the metal mask! You have been emitting a low, continuous humming sound since you sat down! If you cannot control your Quirk and are here to distract others, you should leave immediately!"

The entire auditorium turned to look at Izuku. 

Izuku froze. The boy with glasses wasn't entirely wrong. When Izuku was nervous, his vocal cords would involuntarily vibrate at a sub-audible, low frequency. It was a self-soothing mechanism, like a cat's purr, but because of his massive resonance crest, it could be felt as a slight vibration in the floorboards. 

Bakugo, sitting a few rows over, scoffed loudly. 

Izuku didn't panic. Ten months of training with All Might had given him a spine of steel. He slowly stood up, towering over the surrounding students. He looked down at the boy with glasses, raising his wrist bracer. He typed with blinding speed. 

The robotic voice echoed clearly through the quiet auditorium. 

[I apologize for the ambient vibration. It is an involuntary biological response to adrenaline. It will not happen again. However, if you are so easily distracted by a minor acoustic anomaly, I suggest you heavily reconsider a career in heroics, where battlefields are defined by sensory overload. Let the pro finish his presentation.]

The auditorium was dead silent. The boy with glasses flushed a deep red, bowing sharply. "I... I apologize! Your point is incredibly valid! Please forgive my outburst!" He sat down quickly. 

Present Mic grinned, pointing finger guns at Izuku. "Well said, listener! Now, to answer the question! The fourth villain is a Zero Pointer! An obstacle! My advice? If you see it, run! Now, go get changed, and head to your assigned battle centers! PLUS ULTRA!"

Battle Center B was a sprawling, hyper-realistic replica of a modern city district. Tall concrete buildings, paved streets, and alleyways formed a labyrinth of potential ambushes. 

Izuku stood before the massive steel gates, wearing a specialized tactical tracksuit he had developed for the exam. It was form-fitting to reduce wind resistance, with heavily padded boots to absorb the shock of his own jumps. His heavy titanium muzzle was locked firmly in place. 

He was surrounded by dozens of other applicants, all vibrating with nervous energy. Uraraka was near the front, looking pale. The boy with the glasses—Tenya Iida, Izuku had learned—was stretching his calves, which appeared to have engine blocks built into them. 

"START!" 

Present Mic’s voice boomed from the observation towers. "What's wrong? There are no countdowns in real life! Run, run, run!"

The gates opened, and the crowd surged forward. 

Izuku didn't sprint wildly into the center of the street like the others. He immediately veered off into a narrow alleyway, his massive legs propelling him with shocking speed. He needed to find the robots before the explosive Quirks tore the city apart. He needed to test his control in a live-fire environment. 

He didn't have to wait long. 

Rounding a corner into a small courtyard, Izuku came face-to-face with three robots: two One-Pointers and a Two-Pointer. The machines whirred to life, their red optical sensors locking onto him. 

"TARGET ACQUIRED."

The Two-Pointer raised a mechanical arm, a barrage of rubber bullets firing toward him. 

Izuku didn't flinch. He didn't even unclip his muzzle. 

He lunged forward, moving with the heavy, terrifying grace of an apex predator. He dodged the rubber bullets, closing the distance in three massive strides. He didn't punch the Two-Pointer. Instead, he slapped both of his hands onto the robot’s metal chassis, gripping it tightly, and pressed the very tip of his bony crest against the machine's chest plate. 

Izuku inhaled sharply through his nose, tightening his throat, and hummed. 

It wasn't a roar. It wasn't a shout. It was Infrasound. 

A frequency so low that the human ear could not perceive it, but the physical world could certainly feel it. Izuku channeled the ultra-low frequency vibration directly through his crest and into the metal chassis of the robot. 

Physics dictated that every object had a natural resonance frequency. If you matched that frequency, the object would absorb the acoustic energy until it violently vibrated itself to pieces. 

The effect was immediate and terrifying. The Two-Pointer didn't explode. It seized. The intense, localized vibration instantly shattered the delicate internal gyroscopes and short-circuited the motherboards. The robot’s red eyes flickered and died, the heavy machine slumping lifelessly to the ground in less than a second. 

Izuku released the robot, spinning around to face the two One-Pointers. He leaped into the air, his powerful legs carrying him twenty feet high. He landed directly between the two machines. He pressed his palms flat against the asphalt, transferring the vibration from his vocal cords down through his arms and into the ground. 

A localized, micro-earthquake rippled through the courtyard. The ground didn't crack, but the intense oscillation scrambled the sensors of the One-Pointers. They staggered like drunks, their internal wiring frying from the acoustic friction, before they both collapsed in heaps of smoking metal. 

Four points, Izuku thought, his emerald eyes scanning the area. No collateral damage. No permanent hearing loss. Surgical.

He broke into a run, diving deeper into the city. 

High above the battle centers, in a darkened observation room, the faculty of U.A. High watched the exam through hundreds of camera feeds. 

"We have a promising crop this year," Midnight purred, watching a student shoot lasers from his navel. 

"Indeed," Principal Nezu, a highly intelligent chimera of a mouse, bear, and dog, sipped his tea. "They possess a great deal of raw power. However, true heroism requires more than just flashy destruction. It requires situational awareness and control."

"Speaking of control," Aizawa Shota, the underground hero Eraserhead, narrowed his tired eyes at monitor 4B. "Look at the kid with the muzzle."

Present Mic leaned over, practically vibrating with excitement. "Oh, man! I've been watching him! That's Izuku Midoriya! The kid has a Quirk registered as 'Parasaur', an Emitter/Mutant hybrid. He produces sonic shockwaves from that crest!"

Aizawa frowned. "If he produces sonic shockwaves, why hasn't he destroyed a single building? I'm watching his point tally rise, but he isn't making a sound. He just touches the robots and they die."

Nezu’s beady eyes sparkled with intense fascination. The principal tapped a few keys, bringing up a thermal and acoustic diagnostic of Izuku’s feed. 

The screen bloomed with colors. While Izuku was silent to the human ear, the acoustic sensors were picking up massive spikes of localized Infrasound. 

"Fascinating," Nezu murmured, leaning forward. "He isn't relying on blunt concussive force. He is utilizing sympathetic resonance. He is matching the internal frequencies of the robots' hardware and vibrating them to pieces from the inside out. He’s turning his own body into a tuning fork of destruction, but keeping the area of effect to less than a meter."

"That requires an insane level of biological control," Midnight noted, impressed. "To modulate vocal cords to that degree while in the middle of a combat zone? And the restraint to not just blow everything away... he’s terrifyingly efficient."

"He's acting like an assassin, not an artillery cannon," Aizawa noted, a rare hint of approval in his voice. "He knows his power is a liability to bystanders, so he adapted. Good."

"But," Nezu said, his paw hovering over a large red button on his console, "restraint is easy when the stakes are low. Let us see how they respond when true terror arrives on the battlefield. It's time to test their metal."

Nezu pressed the red button. 

Izuku was standing atop a crushed Three-Pointer, his chest heaving slightly behind his mask. He had forty-five points. It was a solid score. He was relying entirely on his Infrasound and physical agility, avoiding his concussive bursts entirely to conserve his vocal cords and avoid collateral damage. 

Suddenly, the ground beneath the city stopped vibrating from the exam. It began to quake. 

It was a deep, rhythmic tremor. Boom. Boom. Boom.

Izuku turned toward the center of the city, his emerald eyes widening. 

Towering over the five-story buildings, casting a massive shadow across the mock city, was the Zero Pointer. It wasn't just a robot; it was a mechanical titan. Its massive treads crushed entire city blocks as it rolled forward. It punched a building with a fist the size of a bus, sending concrete and rebar raining down into the streets below. 

Panic instantly gripped the applicants. 

"What the hell is that?!"

"Run! Time's almost up anyway!"

"It's a monster!"

The students turned and fled in a massive, chaotic stampede. 

Izuku’s instincts screamed at him to follow them. This was the obstacle. Present Mic had told them to run. There were no points to be gained here. Izuku turned, ready to activate his heavy legs and sprint away. 

“Ow! Help!”

The voice was faint, barely audible over the roaring of the Zero Pointer’s engines and the collapsing masonry, but Izuku’s hyper-sensitive hearing picked it up instantly. 

He whipped his head around. 

Near the base of the Zero Pointer’s destructive path, trapped beneath a massive chunk of fallen debris, was Uraraka. The girl who had stopped him from falling. She was struggling to free her leg, her face pale with terror as the mechanical titan raised its foot, preparing to crush the entire street—and her with it. 

Izuku didn't think. The same instinct that had thrown him into the fire to save Bakugo ten months ago seized control of his body. 

He didn't run away. He ran toward the titan. 

"Hey! What are you doing?! You're going to die!" Iida shouted as he ran past, but Izuku ignored him. 

Izuku sprinted down the street, his mind racing through calculations. 

Infrasound won't work. The mass of the Zero Pointer is too large; I'd need to sustain contact for an hour to find its resonance frequency. Concussive bullets won't work; piercing its armor will only annoy it. I need to stop its momentum entirely. I need to push it back.

Izuku reached up. His fingers found the magnetic lock of his titanium muzzle. 

Click.

He ripped the heavy mask off his face, tossing it to the ground. 

He stopped thirty feet in front of Uraraka, placing himself directly between the trapped girl and the colossal machine. He looked up at the looming metal foot, casting a shadow over him. 

Ten months of restraint, Izuku thought, his heart hammering against his ribs. Ten months of narrowing the aperture. But Toshinori said... a true hero knows when to open the floodgates.

Izuku closed his eyes and tapped into the deepest, most primal part of his genetic mutation. He didn't just want to use the Parasaur Quirk. He wanted to become it. 

Izuku roared, a wet, tearing sound, as his body underwent a rapid, localized transformation. 

It was his Hybrid State, an advanced application of his Quirk he had only achieved twice in training. His already heavily muscled legs bulged, the bones cracking and shifting as he adopted a digitigrade stance—the backwards-bending legs of a true dinosaur. His shoes tore open as his toes elongated into heavy, clawed talons that gripped the asphalt. 

The emerald scales on his neck surged outward, spreading down his shoulders and across his chest, forming a thick, armored hide. And from the base of his spine, a heavy, muscular tail erupted, slamming into the ground to act as a counterweight for the immense force he was about to unleash. 

Uraraka, trapped beneath the rubble, stared up in absolute awe and terror at the bipedal, saurian beast standing between her and death. 

Izuku planted his talons deep into the concrete. He threw his head back, his massive chest expanding. He drew in so much air that a literal vacuum formed in the street, pulling dust and loose debris toward his open mouth. 

His cranial crest ignited. It didn't just glow; it blazed like a blue sun. The bio-luminescence was blinding, the kinetic energy building inside the hollow bone vibrating so intensely that the air around his head began to superheat and distort into visual ripples. 

The Zero Pointer’s foot began to descend. 

Izuku threw his head forward, locking his jaw wide open, aligning the acoustic chamber of his crest directly at the center of mass of the titan. 

"CRETACEOUS CANNON!!!" 

He didn't speak the words; he unleashed them. 

The sound that erupted from Izuku Midoriya was not of this world. It was a prehistoric cataclysm. 

A physical, visible shockwave of compressed sound and atmospheric pressure exploded from his mouth. It looked like a solid beam of distorted, rippling air, traveling at Mach 3. The sheer decibel output was apocalyptic. The asphalt of the street was instantly peeled away, ripped from the earth and thrown backward. 

The shockwave hit the Zero Pointer. 

The laws of physics screamed in protest. The titan, weighing hundreds of tons, was hit with the concussive force of a category-five hurricane concentrated into a fifty-foot radius. 

The mechanical foot didn't even touch the ground. The shockwave slammed into the robot's chest plate. The thick armor instantly buckled, bowing inward as a massive, circular depression formed in the metal. The shockwave didn't pierce the robot; it pushed it. 

With a deafening shriek of tearing metal and exploding hydraulics, the Zero Pointer was lifted entirely off the ground. The force of the soundwave carried the massive machine backward through the air. It flew over two city blocks before crashing down onto its back in a spectacularly violent explosion of fire and sparking circuitry, completely and utterly destroyed. 

The sonic boom carried upward, ripping into the sky and physically parting the clouds above Battle Center B, leaving a massive, clear blue circle in the overcast sky. 

In the observation room, the acoustic dampeners automatically engaged, but the reinforced glass window overlooking the city still cracked. Present Mic was out of his chair, his hands gripping his headphones in absolute shock. Aizawa’s jaw had slightly dropped. Nezu dropped his teacup. 

Back in the street, silence returned, ringing heavily in the ears of everyone present. 

Izuku stood there, smoke billowing from his open mouth in thick, white clouds. His blue crest flickered and died. His scales receded, his legs shifted back to human physiology, and his tail dissolved back into his body. 

He collapsed forward, catching himself on his hands and knees. Blood dripped steadily from his nose, and his throat felt like he had swallowed molten lava. The recoil of the blast had severely bruised his internal organs. 

I did it, he thought, his vision blurring. I didn't kill anyone. I controlled it.

He turned his head slowly, looking back at Uraraka. She was safe. The blast had been entirely focused forward; she hadn't felt anything but a strong gust of wind. She stared at him, her mouth agape. 

"TIME'S UP!" Present Mic’s voice echoed across the ruined city. 

Izuku smiled, a small, weary expression, before his eyes rolled back and he passed out on the ruined concrete. 

One week later. 

Izuku sat in his bedroom, staring blankly at the small, metal disc sitting on his desk. His mother, Inko, paced nervously in the hallway outside. 

He hadn't spoken since the exam. He literally couldn't. His vocal cords were severely inflamed, heavily bruised from the sheer friction of the Cretaceous Cannon. Recovery Girl had healed the worst of the muscular tearing, but she had ordered a strict, two-week vow of absolute silence to let the cartilage heal. He wore his muzzle as a physical reminder not to even attempt a whisper. 

Suddenly, the metal disc on his desk activated. 

A holographic projection shot upward, illuminating the dim room. 

"I AM HERE! AS A PROJECTION!" 

All Might’s booming voice filled the room, his massive, muscular form flexing in a yellow suit. 

Izuku jumped, his heart pounding. 

"Young Midoriya!" All Might pointed directly at the camera. "You must forgive the delay! The paperwork for this year’s exam was monumental! I am here to deliver your results personally, because I will be joining the U.A. faculty this year!"

Izuku gasped silently, his eyes widening. All Might as a teacher? 

"You scored forty-five villain points on the practical," All Might said, his expression turning serious. "A passing grade, certainly. But it barely scratches the surface of your potential. However... U.A. is not just a school that measures destructive capability."

The hologram shifted, showing a video feed from the exam. It was Uraraka, standing before Present Mic in the faculty office. 

“Excuse me!” the holographic Uraraka pleaded, her hands clasped together. “That boy with the muzzle... the one with the dinosaur horn. Can I give him some of my points? He saved my life! If he hadn't jumped in, I would have been crushed!”

Izuku felt a lump form in his bruised throat. She had gone to bat for him. 

"How could a hero course reject someone who risks their life to save another?" All Might asked softly, his smile returning, full of warmth and immense pride. "That is the core of heroics, Young Midoriya. That is what you proved ten months ago in that fiery alleyway, and that is what you proved against the Zero Pointer."

A massive scoreboard appeared on the hologram. 

Izuku Midoriya. 

Villain Points: 45.

Rescue Points: 60.

Total Score: 105. 

Rank: 1st Place. 

Izuku stared at the numbers. First place. He had beaten everyone. He had beaten Bakugo. 

"You unleashed your power to protect, not to destroy," All Might said, reaching out as if he could touch Izuku through the hologram. "Welcome, Izuku Midoriya. This is your Hero Academia."

The projection fizzled out, leaving Izuku in the quiet of his room. 

He didn't cry. He didn't yell. He simply reached up, unclasped his muzzle, and smiled so widely it hurt his cheeks. 

He had shattered the sky. Now, it was time to reach it.

The alarm clock didn't ring. It flashed a bright, strobe-like red light across the dark room. 

Izuku Midoriya reached out a heavy, calloused hand and slammed the snooze button. He sat up, the mattress groaning in protest under his dense, heavily muscled frame. He stretched his arms high above his head, rolling his shoulders until his joints popped with a sound like cracking firewood. The morning air was cool, but Izuku’s internal body temperature always ran hot—a byproduct of the saurian genetics woven into his DNA. 

He swung his legs out of bed and walked over to his mirror. 

At fifteen, Izuku looked less like a high school freshman and more like a seasoned underground Pro Hero. The grueling ten months of clearing Dagobah Beach had packed dense, functional muscle onto his frame. His neck was thick, braced by the iridescent emerald scales that protected his windpipe. And extending from the back of his skull was his crest, a beautiful, terrifying crown of bone and kinetic energy. 

Sitting on his dresser was his new lifeline. 

U.A. High’s Support Company had worked in tandem with All Might to design it. It was a masterpiece of acoustic engineering. The muzzle was forged from a lightweight, gunmetal-grey titanium alloy. The interior was lined with a state-of-the-art kinetic-absorbing gel that molded perfectly to his jawline, ensuring that any accidental low-frequency hums wouldn't vibrate his teeth loose. It fastened securely around the back of his neck with a biometric magnetic lock that only he or a recognized Pro Hero could disengage. A specialized, reinforced mesh grille covered his mouth, baffled in a way that allowed optimal oxygen intake while completely diffusing the concussive force of a cough or a sneeze. 

Izuku picked it up, feeling its familiar, comforting weight, and snapped it into place over his lower face. The gel cooled against his skin. The lock chimed softly. 

He strapped the digital synthesizer bracer onto his left wrist. He was ready. 

"Izuku, honey! You’re going to be late!" Inko’s voice called from the kitchen. 

Izuku grabbed his U.A. uniform—custom-tailored to accommodate the broadness of his chest and the slight hunch of his posture—and quickly dressed. When he walked into the kitchen, his mother was hovering over a plate of eggs and toast, dabbing her eyes with a tissue. 

She looked at her son, her towering, muzzled, monstrously powerful boy, and saw only the sweet child who loved All Might. 

"You look so handsome in that uniform," Inko sniffled, rushing forward to adjust his red tie. 

Izuku smiled behind the mask. He raised his wrist bracer, typing with lightning speed. 

[Thank you, Mom. I promise I'll make you proud today.]

"You already have, Izuku," she whispered, hugging his solid torso. "Just... be careful. And remember what the doctor said about your throat."

Izuku nodded. His vocal cords had healed from the severe bruising of the Entrance Exam, but the memory of the searing pain was fresh. The Cretaceous Cannon was an ultimate move, a last resort. Today was just orientation. There would be no need for that kind of firepower. 

Or so he thought.

Class 1-A’s door was ridiculously large. 

Izuku stood before the massive '1-A' painted on the wood, deducing instantly that it was designed for students with gigantification mutations. He took a deep, muffled breath, his chest rising and falling, and slid the heavy door open. 

The classroom was already buzzing with energy. As soon as Izuku stepped over the threshold, however, the volume in the room dropped significantly. 

Eyes turned to him. The sheer physical presence of Izuku Midoriya was impossible to ignore. The dark green hair, the sweeping bony crest, the intimidating titanium muzzle, and the cold, calculating emerald eyes scanning the room. 

"It's him," a boy with red, spiky hair whispered loudly. "The guy from the Entrance Exam. The one who punched the sky open."

"He looks terrifying," a girl with pink skin and horns muttered, shrinking slightly in her seat. 

"Remove your feet from that desk immediately!" 

Izuku turned to see Tenya Iida, the boy with engine-legs from the auditorium, aggressively chopping his hands through the air at Katsuki Bakugo. Bakugo was slouched in his chair, his feet propped up on his desk, his red eyes burning with a volatile mixture of boredom and rage. 

"Huh? Who the hell are you to tell me what to do, Four-Eyes?" Bakugo sneered, tiny sparks popping off his fingertips. 

"I am Tenya Iida, from Somei Private Academy! And you are disrespecting the legacy of the upperclassmen who used these desks before us!"

"Somei? So you're an elite prick," Bakugo laughed mockingly. "I'm gonna have fun crushing you."

Iida gasped, scandalized, before turning and spotting Izuku by the door. Iida instantly abandoned Bakugo and marched toward Izuku with robotic precision. 

"You!" Iida announced, bowing at a perfect ninety-degree angle. "I am Tenya Iida! I must apologize for my behavior during the orientation! You realized there was a practical application to the Zero Pointer, didn't you? You saw the true purpose of the exam while the rest of us ran blindly like cowards! I completely misjudged you. You are truly worthy of U.A.!"

Izuku blinked, slightly overwhelmed. He raised his wrist to type a response, but before he could finish, a cheerful voice echoed from the hallway. 

"Oh! It's you! The boy with the cool horn!"

Ochaco Uraraka pushed past Izuku, beaming up at him. "I'm so glad you made it! I didn't get a chance to thank you properly after the exam! You were amazing! That blast was like... BOOM! And then the robot was just... WOOSH!" She punctuated her sentence with wild hand gestures. 

Izuku felt his cheeks heat up behind the kinetic gel of his mask. He quickly finished typing on his bracer. 

[Thank you, Uraraka. I am glad you were not injured. Iida, it is a pleasure to formally meet you. There is no need to apologize. In stressful situations, we all act differently.]

The robotic voice from his wrist synthesizer caught a few of the other students off guard, drawing more curious stares. 

Bakugo, watching from his desk, ground his teeth together. The sound of that synthetic, emotionless voice grated on his nerves like sandpaper. He’s acting so high and mighty. Playing the silent, mysterious hero. I'll rip that mask off his face and make him scream.

"If you're just here to make friends, you can pack up your things and leave."

The voice came from the floor. 

Izuku, Iida, and Uraraka jumped, looking down. Lying on the floor in a yellow sleeping bag, drinking a juice pouch, was a scruffy, exhausted-looking man. He unzipped the sleeping bag and stood up, revealing himself to be a tall man clad in black tactical gear, with a long grey scarf wrapped around his neck. 

Izuku’s analytical mind immediately supplied the data. Eraserhead. The Underground Hero. He can erase Quirks by looking at them. A logical, no-nonsense combatant.

"I'm Shota Aizawa. Your homeroom teacher," the man said, his voice a dry drawl. He reached into his sleeping bag and pulled out a blue and white gym uniform. "It took you all eight seconds to quiet down. Time is a limited resource. You kids aren't rational enough."

He tossed the uniform onto the front desk. "Put these on and head out to the P.E. grounds."

The P.E. grounds were a sprawling expanse of dirt and meticulously painted white lines. The morning sun beat down on Class 1-A as they stood before their homeroom teacher, confused and anxious. 

"A Quirk Apprehension Test?!" the class echoed in unison. 

"What about the entrance ceremony? Or guidance counseling?" Uraraka asked, clutching the fabric of her gym shirt. 

"No time for useless traditions here," Aizawa said, his eyes scanning the students like a predator evaluating prey. "U.A. operates on a freestyle educational system. That means I run my class however I see fit. You've been restricted from using your Quirks in physical tests since elementary school. It's an irrational system designed to promote an illusion of equality. But we aren't here to be equal. We're here to see what you're actually capable of."

Aizawa turned to Bakugo. "Bakugo, you finished first in the practical exam, didn't you?"

Izuku internally flinched. He had placed first in total points, but Bakugo had scored the highest in pure villain takedown points. 

"In middle school, what was your best result for the softball throw?" Aizawa asked. 

"Sixty-seven meters," Bakugo replied, stepping forward with an arrogant smirk. 

"Try it with your Quirk." Aizawa tossed Bakugo a baseball. "Stay in the circle. Anything goes, just don't leave the ring."

Bakugo stepped into the white chalk circle. He stretched his arms, a wicked grin spreading across his face. He wound his arm back, his palm glowing with ignited nitroglycerin sweat. 

"DIEE!!" Bakugo roared, violently throwing the ball while simultaneously unleashing a massive, concussive explosion from his palm. 

The shockwave rattled the windows of the distant school building. The ball rocketed into the sky, propelled by the blast, leaving a trail of black smoke in its wake before disappearing over the horizon. 

Aizawa held up a small digital tracker. It beeped. He turned the screen around for the class to see. 

705.2 meters.

The class erupted into gasps of awe and nervous excitement. 

"705 meters?! That's insane!" 

"This looks like so much fun!"

"We can really use our Quirks! Finally!"

Aizawa’s eyes darkened, the bags under them seeming to deepen. "'Fun,' you say? You have three years to become heroes. You think it's going to be games and playtime?" 

Aizawa smiled, a terrifying, manic expression that chilled Izuku to the bone. "Right then. New rule. Whoever comes in last place in all eight tests will be judged to have no potential and will be punished with immediate expulsion."

The silence that fell over the field was deafening. 

"Expulsion?!" Uraraka cried out. "That's not fair! It's our first day!"

"Natural disasters, massive accidents, villain attacks. The world is full of unfairness," Aizawa said coldly. "Heroes are the ones who correct that unfairness. If you wanted to hang out with friends, you should have gone to a normal high school. Here at U.A., we will push you to your absolute limits. Plus Ultra. Now, let's begin."

The first test was the 50-meter dash. 

Izuku was paired against a boy with blonde hair and a sparkling belt. As they lined up at the starting block, Izuku didn't reach for his muzzle. He didn't need his emitter Quirk for this. 

He was a mutant hybrid. His parasaurolophus physiology was not just confined to his head and lungs. His legs, heavily muscled and supported by a denser bone structure to carry his top-heavy weight, were built for explosive bursts of speed. 

"On your marks..." a robotic voice called out from a camera droid. "Get set..."

Izuku lowered his center of gravity, digging his heavy track shoes into the dirt. 

"BANG!"

The blonde boy shot forward, firing a laser from his navel to propel himself backward, soaring over the track. 

Izuku simply pushed off. 

The ground beneath his starting block literally cratered. The sheer kinetic force of his saurian leg muscles firing at once launched him forward like a cannonball. He didn't run with the elegant stride of Iida; he bounded with the terrifying, heavy strides of an apex predator closing in on prey. Each footfall sounded like a sledgehammer hitting the dirt. 

He crossed the finish line in a blur of green. 

3.14 seconds, the robot announced. 

Izuku slowed to a halt, breathing steadily through his mask. He looked over to see Aizawa watching him intently, a small, appraising nod the only sign of his reaction. 

Next was the grip strength test. 

Izuku gripped the digital dynamometer. His hands were massive, his fingers thick and calloused. He squeezed. His mutant physiology, combined with the ten months of hauling rusted refrigerators across a sandy beach, paid off. The machine beeped frantically before the digital screen cracked slightly. 

156 kg. 

It wasn't the 540 kg of the multi-armed boy, Mezo Shoji, but it was comfortably in the top tier of the class. 

The standing long jump. The sustained side steps. Izuku breezed through them all, relying entirely on his physical prowess. He was acutely aware of the stares he was receiving. His classmates were waiting for him to unleash the devastating power they had seen on the news and heard about from the Entrance Exam. 

Finally, they arrived at the fifth test. The softball throw. 

Uraraka went first, using her Zero Gravity Quirk to make the ball weightless. The tracker displayed an infinity symbol, sending the class into an uproar of cheering. 

"Midoriya," Aizawa called out. "You're up."

Izuku stepped into the white circle. Aizawa tossed him the baseball. Izuku caught it, feeling the smooth leather against his calloused palm. 

He stood there for a moment, looking out over the empty field. 

He knew he could throw it normally and easily clear 80 or 90 meters with his physical strength. It would be a respectable score. It would keep him safe from expulsion. But Aizawa’s words echoed in his mind: Here at U.A., we will push you to your absolute limits.

Aizawa wasn't just testing their physical capabilities; he was testing their willingness to utilize their Quirks efficiently under pressure. 

Izuku reached up to the back of his neck. His fingers found the magnetic lock. 

Click. 

He pulled the titanium muzzle away, hooking it onto his belt. 

The class instantly tensed. Several students subconsciously took a step backward, covering their ears. Even Bakugo stopped glaring and watched intently, his fists clenched tight. 

Izuku took a slow, deep breath. He didn't need to transform his legs or manifest his tail. He just needed his chest and his head. 

His lungs expanded, his ribcage shifting beneath his gym uniform. The emerald scales on his neck flared outward, locking together. The massive bony crest on his head began to hum, a deep, resonant vibration that made the dust at his feet dance. The blue bioluminescence ignited, sending pulses of neon light tracing up the bone. 

Izuku raised the ball, holding it directly in front of his face, about three inches from his mouth. 

He tightened his diaphragm. He didn't need a concussive shockwave. He needed a precise, directed kinetic pulse. 

Suddenly, the blue light on his crest flickered and died. The humming stopped. Izuku’s lungs deflated, his scales softening. 

He gasped, staggering forward slightly, his eyes wide in confusion. He looked around. 

Standing a few feet away, Aizawa’s scarf was floating wildly in the air around him. The teacher’s eyes were glowing a brilliant red, locked furiously onto Izuku. 

"I erased your Quirk," Aizawa said, his voice cold and sharp. "Though, considering your hybrid nature, I couldn't erase your physical mutation. Your crest and lungs are still there, but the Emitter aspect—the kinetic energy generation and acoustic multiplication—is shut down."

Izuku slowly lowered the ball. He raised his wrist bracer. 

[Did I do something wrong, Sensei?]

"Your Entrance Exam tape," Aizawa said, stepping closer. "You showed remarkable restraint against the standard villains, utilizing localized Infrasound. It was brilliant. But against the Zero Pointer... you leveled three city blocks. You destroyed millions of yen in infrastructure. You deafened half the observation equipment."

Aizawa stopped just outside the chalk circle. "Your Quirk is a localized earthquake. You generate forces equivalent to high-yield explosives, but without the heat. If you use that much power in a hostage situation, you don't just kill the villain; you liquefy the hostages, you collapse the building, and you bury the first responders. Relying on overwhelming, indiscriminate power makes you a liability, Midoriya. The fact that you have to wear that muzzle just to exist in public proves you do not have mastery over your own biology."

Izuku stood in silence. Every word Aizawa spoke was a fear Izuku had harbored in his own heart for a decade. It was the reason he had worn the muzzle. It was the reason he hated his own voice. 

"I cannot allow a student who cannot control his own destructive output to operate in the field," Aizawa finished, his glowing eyes unblinking. "If you cannot show me precision right now, you will be expelled."

Bakugo smirked in the background. Finally. Someone sees the freak for what he is. A walking disaster.

Izuku looked down at the baseball in his hand. 

Aizawa was right. The Cretaceous Cannon was too destructive. The Infrasound was too close-range. He needed a middle ground. He needed the sniper rifle Toshinori had taught him to use on the beach. He had to prove he wasn't just a bomb waiting to go off. 

Izuku looked back up at Aizawa. His emerald eyes burned with a fierce, unwavering determination. He didn't type on his bracer. He just gave Aizawa a sharp, confident nod. 

Aizawa blinked. His eyes returned to their normal black, and his scarf fell back to his shoulders. "Show me."

Izuku stepped back to the edge of the circle. He raised the ball in front of his face once again. 

He visualized his anatomy. He visualized the aperture of his throat. He visualized the microwave on the beach, the perfect, circular hole punched through the steel. 

His crest ignited once more, a bright, controlled blue. He drew in a breath, his scales locking into place. But this time, he didn't expand his chest to maximum capacity. He only took in exactly what he needed. 

Izuku focused all of his acoustic energy into a space no larger than a coin. He pressed his lips together, leaving only a microscopic gap directly in front of the baseball. 

He didn't roar. 

He barked. 

"HAH!"

It was a sharp, staccato burst of hyper-compressed air and sound. It sounded like a cannon firing, but with zero residual echo. There was no massive shockwave that ripped the earth apart. There was only a singular, focused kinetic bullet. 

The concentrated soundwave struck the back of the baseball perfectly. 

The ball warped, compressing to half its size under the immense pressure before instantly snapping back to shape, acting as a secondary propellant. A loud CRACK split the air, breaking the sound barrier, as a miniature sonic boom formed a ring of condensation around the ball. 

The baseball vanished into the sky, propelled by a perfect, frictionless corridor of sound. 

Izuku stood his ground. He didn't stumble. He didn't cough. The recoil was perfectly absorbed by his reinforced neck muscles and his dense legs. He casually picked up his muzzle and snapped it back over his face. 

The class was dead silent, staring at the sky where the ball had disappeared. 

Aizawa looked at the digital tracker in his hand. He stared at it for a long moment, a slow, predatory grin spreading across his face. He turned the screen around. 

1,524.3 meters.

"Over a kilometer and a half?!" Kaminari, the blonde boy, yelled, clutching his head. "He just yelled at a ball and it went into orbit!"

"That wasn't just raw power," Iida noted, pushing his glasses up his nose, his eyes wide in awe. "Did you see? The shockwave didn't spread. He localized the acoustic pressure into a concentrated kinetic impact. The amount of biological control required to manipulate sound waves to that degree is astounding."

Aizawa pocketed the device. "Precision. Acceptable, Midoriya. Go back to the line."

As Izuku walked back, the students instinctively parted for him again, but this time, it wasn't out of fear of a monster. It was out of sheer respect for a powerhouse. 

As he passed Bakugo, the explosive blonde grabbed Izuku by the shoulder of his gym shirt. Bakugo’s eyes were bloodshot, his teeth bared in a feral snarl. 

"What the hell was that, Deku?" Bakugo whispered, his voice trembling with rage. "You're hiding things. You're holding out on me. I saw your eyes. You think you've figured it all out, don't you? You think you're better than me."

Izuku stopped. He didn't shake Bakugo’s hand off. He raised his wrist bracer and typed a single sentence. 

[I think I am finally learning how to speak for myself.]

Bakugo shoved him away, his hands sparking furiously. "I'll kill you. I swear to God, Deku. The next time we fight, I'm going to rip that horn out of your skull."

Izuku simply adjusted his mask and walked back to his spot beside Uraraka, who gave him a huge, supportive thumbs up. 

The tension that had simmered on the physical education field reached a boiling point the following afternoon. 

"I AM HERE! COMING THROUGH THE DOOR LIKE A NORMAL PERSON!"

All Might’s entrance into Class 1-A was as spectacular and dramatic as the man himself. He struck a pose in his Silver Age costume, his massive cape billowing behind him. The class erupted into cheers and starry-eyed gasps. Izuku, despite knowing the man personally for ten months, couldn't help but feel a surge of pure fanboy joy. 

"Hero Basic Training!" All Might announced, his voice booming. "The class that will put you through all sorts of special training to mold you into heroes! And today's activity is... BATTLE TRAINING!"

Bakugo, sitting in front of Izuku, let out a dark, menacing chuckle. 

"And to go with it," All Might pointed a remote at the wall, prompting sections of the wall to slide open, revealing numbered metal briefcases. "Costumes made based on your Quirk registrations and requests sent in before school started! Get suited up and head to Ground Beta!"

The locker room was a flurry of excitement as the boys pulled out their new gear. 

Izuku opened his briefcase. He had spent weeks drafting his costume design. He didn't want spandex. He didn't want flashy colors that screamed 'look at me.' He wanted utility. He wanted gear that supported his monstrous biology. 

Ten minutes later, Izuku emerged from the tunnel into Ground Beta, an incredibly detailed replica of an urban city. 

The class stared. 

Izuku’s hero costume was a masterclass in tactical integration. He wore a dark, forest-green combat suit made of interwoven kevlar and kinetic-absorbing mesh. It was sleeveless, allowing his massive, muscular arms full range of motion. Heavy, reinforced steel-toed combat boots anchored his thick saurian legs. A heavily armored chest plate protected his vitals. 

But the true marvels were his support items. 

His titanium muzzle remained, but it was now integrated with a sleek, aerodynamic visor that covered the upper half of his face. The visor served a dual purpose: it offered tactical readouts and, more importantly, it locked over his ears with heavy-duty acoustic dampeners, protecting his own eardrums from the catastrophic decibel levels he could produce. 

Finally, over his hands, he wore heavy, gauntlet-like gloves. They weren't meant for punching. Built into the palms of the gloves were specialized, highly advanced directional speakers and acoustic channeling ports. By placing his hands in front of his muzzle, he could pipe his soundwaves directly into the gauntlets, allowing him to fire concussive blasts from his palms, giving him a range of motion and mobility he had never possessed before. 

"Whoa, Midoriya," Kirishima said, walking over in his shirtless, gear-themed costume. "You look like a walking tank. So manly!"

"That gear looks incredibly heavy," Iida noted, encased in his own white armor. "But considering your mutant physiology, I suppose it feels quite light to you."

Izuku nodded, typing on his bracer. [It is designed for kinetic absorption and acoustic direction. Function over form.]

"Alright, settle down, embryos!" All Might boomed. "The situation is this! Villains have hidden a nuclear weapon somewhere in their hideout! The heroes must either capture the villains or secure the weapon! You will be drawn into teams of two by lots!"

The drawing proceeded quickly. 

"Team A will be Izuku Midoriya and Ochaco Uraraka!" All Might announced. 

Uraraka cheered, bouncing over to Izuku. "Yay! We're a team, Midoriya! We're gonna do great!" 

"And Team D will be Katsuki Bakugo and Tenya Iida!" 

Izuku froze. He looked across the crowd of students. 

Bakugo was staring directly at him. The explosive boy’s costume was aggressive—black tank top, massive grenade-shaped gauntlets on his forearms, and a mask that flared out like an explosion. Bakugo’s eyes were wide, a terrifying, bloodthirsty grin splitting his face. He drew a thumb across his throat. 

"The first match to take place will be..." All Might drew two balls from a box. "Team A as the Heroes, versus Team D as the Villains!"

The air in Ground Beta suddenly felt ten degrees colder. 

"Villain team, head inside and prepare! Hero team, you have five minutes to strategize!"

As Bakugo and Iida walked into the massive, five-story concrete building that served as the villain hideout, Izuku pulled Uraraka aside into a nearby alleyway to go over their plan. 

He raised his bracer, his fingers flying across the keys. 

[Uraraka. Bakugo will not stay with the weapon. He holds a deep, personal grudge against me. He will abandon the objective and hunt me down immediately to prove his superiority.]

"A grudge?" Uraraka asked, her brow furrowing. "Why? You're so nice!"

[My Quirk is powerful, but destructive. Because I chose not to use it to avoid hurting people, he viewed it as me looking down on him, pretending I didn't need to try. When he attacks, he will aim to kill. I will draw his fire. I need you to bypass us and find Iida. Iida is tactical; he will stay with the weapon.]

"Are you going to be okay by yourself?" Uraraka asked, looking up at his towering frame and the intimidating metal mask. 

Izuku looked up at the building. A memory flashed through his mind—four-year-old Bakugo lying in the dirt, bleeding from his ears, looking at Izuku like he was a monster. 

Izuku typed his response. [I will handle Kacchan. It is time we had a conversation.]

Inside a dark room on the fourth floor, Iida was pacing around the large paper-mache nuclear weapon. 

"Bakugo, we should set up barricades! If Midoriya possesses the ability to shatter structural integrity from a distance, we need to create choke points!"

Bakugo didn't answer. He was standing by the door, staring into the dark hallway. His hands were twitching, small, violent pops of light illuminating his furious face. 

"Bakugo? Are you listening to me?" Iida asked, adjusting his glasses. 

"Shut up, Four-Eyes," Bakugo growled, his voice a low, dangerous rumble. "The nerd is mine. I'm going to blow that muzzle off his face and make him beg for mercy. I'm going to show him what a real hero looks like."

Before Iida could protest, Bakugo bolted out the door, disappearing into the labyrinth of the building. 

"HERO TEAM, INFILTRATE!" All Might’s voice echoed through the PA system. 

Izuku and Uraraka slipped through a first-floor window. The interior of the building was a maze of concrete hallways, dimly lit and echoing with every footstep. Izuku moved with surprising stealth for a boy of his size, walking on the balls of his heavy, padded boots. 

He kept his ears peeled, his saurian hearing picking up the faint hum of the building's ventilation and the distant sound of shifting rubble. 

He's coming, Izuku thought, stepping in front of Uraraka as they reached an intersection. 

POP. SIZZLE. 

The smell of burnt caramel and ozone flooded the hallway. 

From around the corner, Katsuki Bakugo launched himself through the air, propelled by a massive explosion from his left hand. His right hand was drawn back, glowing with immense heat, aimed directly at the center of Izuku’s chest. 

"DIE, DEKU!"

Izuku didn't flinch. His reaction time was honed by a lifetime of analyzing combat. He grabbed Uraraka by the shoulder and violently shoved her backward out of the blast radius. 

Izuku brought his massive arms up, crossing them over his chest. 

BOOM!

The explosion hit Izuku point-blank. The hallway was engulfed in fire and smoke. The concrete walls cracked under the concussive force. 

Uraraka screamed from the floor. "Midoriya!"

The smoke cleared. 

Izuku was still standing. His combat suit was singed, and the kinetic-absorbing mesh had hardened on impact, dispersing the heat and force across his entire body. His steel-toed boots had gouged deep tracks into the concrete floor, but he hadn't been knocked down. 

Bakugo landed a few feet away, his eyes widening slightly as he saw Izuku brush the soot off his chest plate. 

Izuku turned to Uraraka and pointed swiftly down the adjacent hallway, a silent command to move. Uraraka nodded, scrambling to her feet and sprinting away toward the stairs. 

"Oh no you don't!" Bakugo yelled, raising his hand to fire a blast at her retreating back. 

Izuku moved faster. In a blur of green, his saurian leg muscles fired, closing the distance instantly. Before Bakugo could ignite his sweat, Izuku grabbed Bakugo’s forearm with a vice-like grip, his massive, calloused hand entirely encompassing Bakugo’s wrist. With a brutal twist of his hips, Izuku threw Bakugo over his shoulder, slamming the explosive boy into the concrete floor with bone-rattling force. 

Bakugo gasped, the wind knocked out of him. He stared up at Izuku, infuriated. He brought his free hand up, blasting an explosion directly into Izuku’s masked face. 

The blast washed over Izuku, but the titanium muzzle and the tactical visor took the brunt of the heat. Izuku didn't even blink. He released Bakugo and stepped back, giving his opponent room to stand. 

"You bastard," Bakugo coughed, scrambling to his feet. "You read my move. You knew I'd lead with a right hook."

Izuku raised his wrist bracer. 

[I have spent my entire life writing notes on you, Kacchan. I know your combat patterns. You always lead with a large right-handed sweep to disorient, followed by a left-handed grapple.]

"Don't give me that robotic crap!" Bakugo screamed, charging forward again. "Talk to me! Use your real voice, you coward!"

Bakugo unleashed a flurry of close-range explosions, a dizzying array of fiery hooks and jabs. Izuku was forced on the defensive. He couldn't risk a sonic blast in the narrow hallway; the acoustic ricochet would tear the walls apart and likely collapse the ceiling on them. Instead, Izuku relied on his mutant physiology, dodging, weaving, and absorbing the blows that slipped past his guard. 

"Ten years!" Bakugo roared, landing a glancing blow on Izuku’s shoulder. "Ten years you looked at me from behind that damn muzzle! I thought you were weak! I thought you were broken! But you were just hiding! You had a Quirk stronger than All Might’s, and you sat there, pretending to be a pathetic, Quirkless loser!"

Izuku parried a punch, shoving Bakugo back. He typed frantically. 

[I was not pretending! I was terrified! I almost killed you on that playground, Kacchan!]

"I DON'T CARE ABOUT THE PLAYGROUND!" Bakugo screamed, his voice cracking with raw, unbridled emotion. Tears of pure frustration prickled at the corners of his red eyes. "You think I needed your pity?! You think I needed you to hold back so I could feel strong?! You mocked me! Every time you held your breath, every time you looked down at your hands, you were telling me I wasn't worth your real power!"

Izuku froze. 

The realization hit him like a physical blow. All this time, Izuku thought Bakugo hated him because Izuku was a monster. Because Izuku was dangerous. But Bakugo didn't fear the monster. Bakugo felt insulted that the monster didn't think he was a worthy opponent. Bakugo’s entire worldview—that he was the absolute best—was shattered the day Izuku produced that shockwave, and Izuku’s subsequent silence was interpreted as the ultimate act of condescension. 

Bakugo slowly raised his right arm. His left hand gripped the massive metal pin on his grenade gauntlet. 

"I'm done playing, Deku," Bakugo breathed, his eyes wide and manic. "They designed these gauntlets to store my nitroglycerin sweat. The more I sweat, the stronger the blast. If I pull this pin... the blast will be big enough to level this entire floor."

In the observation room, the students watched the monitors in horror. 

"Sensei! You have to stop them!" Kirishima yelled. "Bakugo is actually going to kill him!"

All Might grabbed the microphone, his hands trembling. "Young Bakugo! Stop! Are you trying to kill him?!"

"If he doesn't dodge, he won't die!" Bakugo yelled back, a deranged smile on his face. 

He pulled the pin. 

Time seemed to slow down. The heavy metal pin slipped out of the gauntlet. The striker ignited the massive chamber of concentrated nitroglycerin sweat. A blinding, white-hot light erupted from the barrel of the gauntlet. 

A localized sun was born in the hallway. A devastating shockwave of fire and kinetic energy surged forward, consuming everything in its path, melting the concrete and vaporizing the air. 

It was an unstoppable force. 

Izuku Midoriya stared into the encroaching inferno. 

He didn't dodge. He couldn't. If he dodged, the blast would tear through the walls and hit Uraraka on the upper floors. 

Izuku reached up. He unlocked his muzzle, tossing it aside. 

He didn't panic. He didn't roar. He engaged his intellect, the beautiful, tactical mind he had cultivated in the silence. 

What is an explosion? Izuku thought, watching the fire rush toward him. It is rapid combustion. It requires fuel, heat, and oxygen. It produces a concussive shockwave. A wave. Sound is also a wave.

Izuku brought his hands up, pressing the palms of his directional gauntlets against his mouth, forming a tight seal. He drew in a massive breath, his crest blazing with an impossibly bright, piercing blue light. 

If I match the exact amplitude of his explosive shockwave, but invert the phase by 180 degrees... I create destructive interference. And if I combine it with a low-frequency pressure differential, I can create a temporary vacuum.

Izuku unleashed his frequency through the gauntlets. 

He called it: "Anti-Sound."

It was entirely silent to the human ear, but the physical effect was god-like. 

A massive, invisible wall of pure, inverted acoustic energy rippled forward from Izuku’s palms. It met Bakugo’s fiery explosion dead in the center of the hallway. 

The two forces didn't clash. They negated. 

The destructive interference of Izuku’s soundwave completely flattened the kinetic shockwave of the explosion. The fire, suddenly devoid of its carrying force, met the localized acoustic vacuum Izuku had created. The oxygen was violently pushed out of the hallway. 

Without oxygen, the fire simply... vanished. 

One second, Bakugo was unleashing a hellish inferno. The next second, the hallway was perfectly, eerily clear. There was no fire. There was no smoke. There was only a massive, perfectly spherical indentation in the concrete floor where the two waves had canceled each other out. 

Bakugo stood there, his arm still extended, staring at the empty air. His brain physically could not process what had just happened. He had unleashed his ultimate move, and Deku had simply deleted it from existence. 

"W-What...?" Bakugo stammered, dropping his arm. 

Izuku lowered his hands. His crest was still glowing. Smoke drifted lazily from his open mouth. He looked at Bakugo. He didn't use his synthesizer. He didn't use sign language. 

Izuku took a step forward, his heavy boots crunching on the ruined concrete. He took a shallow breath, vibrating his vocal cords at a highly specific, low-level frequency. 

"I... am not... looking down on you, Kacchan."

Izuku’s real voice filled the hallway. It was terrifying. It wasn't the high-pitched voice of a normal teenager. Because of his massive, mutated vocal cords and the resonance of his crest, his voice was layered. It possessed a deep, sub-audible bass that literally rattled the iron in Bakugo’s blood, layered beneath a gravelly, resonant baritone. It sounded like the earth itself was speaking. 

Bakugo stumbled backward, physically vibrating from the sheer acoustic weight of Izuku’s words. 

"I am looking... at you," Izuku rumbled, his voice echoing off the concrete, vibrating the walls. "You are... strong. So... I must be stronger."

Izuku didn't give Bakugo time to recover. He took another deep breath, his chest expanding, and let out a sharp, concentrated concussive roar—not a lethal blast, but a physical wall of compressed air, perfectly calibrated. 

The shockwave hit Bakugo like a speeding truck. It wasn't meant to break bones; it was meant to overwhelm the nervous system. The sheer atmospheric pressure knocked the air out of Bakugo’s lungs and rattled his brain against his skull. 

Bakugo was thrown backward, skidding across the floor before slamming into the wall. His eyes rolled back into his head, and he slumped forward, completely unconscious. 

Silence reclaimed the hallway. 

Izuku coughed, a small trickle of blood running from his nose. Speaking words was incredibly painful; his vocal cords were designed for raw, sustained tones, not the complex articulation of human language. He picked up his muzzle, snapping it back into place, relishing the soothing coolness of the kinetic gel. 

Through the earpiece in his visor, he heard Uraraka’s voice. 

"Midoriya! I secured the weapon! Iida is tied up!"

"HERO TEAM WINS!" All Might’s voice roared through the PA system, though it sounded slightly shaky. 

In the observation room, Class 1-A stood in absolute, stunned silence. They had just witnessed Katsuki Bakugo—the boy who had thrown a baseball into orbit and fought like a demon—get systematically dismantled, outsmarted, and overpowered by the boy with the muzzle. 

Izuku Midoriya wasn't just a heavy hitter. He was a strategic genius who could rewrite the laws of physics on the fly. 

Izuku walked over to Bakugo’s unconscious form. He reached down, carefully hoisting his childhood friend over his broad shoulder. He turned and began the long walk out of the building. 

He had established his dominance. He had protected his team. And for the first time in his life, he had used his voice to tell the truth.

The bus ride to the Unforeseen Simulation Joint (USJ) was surprisingly peaceful. 

Class 1-A sat comfortably in the wide seats of the specialized U.A. transport vehicle. The tension that had choked the air during the battle trials a few days prior had largely dissipated, replaced by a nervous, excited chatter about their first off-campus rescue training. 

Izuku Midoriya sat near the middle of the bus, his massive frame taking up a seat and a half. He was in his full hero costume—the dark green kevlar suit, the heavy boots, the acoustic gauntlets, and the sleek titanium visor-muzzle combination. He stared out the window, watching the city blur by, his emerald eyes calm and calculating. 

"Hey, Midoriya," a voice called out. 

Izuku turned his head. Sitting across the aisle was Tsuyu Asui, a girl with a prominent frog mutation. She rested a finger on her chin, her large, dark eyes blinking slowly. 

"I generally say what's on my mind," Tsuyu said, her voice a soft croak. "Your Quirk... it's really something else. I've never seen anyone manipulate sound waves like that. It's like you're carrying a natural disaster in your throat."

Izuku raised his wrist bracer. [Thank you, Asui. It requires a significant amount of biological control.]

"Call me Tsu," she corrected. "And honestly, the way you handled Bakugo? It was ribbiting. I mean, riveting."

A few rows back, Katsuki Bakugo sat with his arms crossed, staring intensely at the floor. He hadn't said a word to Izuku since he had woken up in Recovery Girl's office. The absolute, crushing defeat he had suffered—having his ultimate explosion snuffed out like a candle and being knocked out by a single, controlled shockwave—had severely damaged his ego. But strangely, it hadn't sent him into a blind rage. Instead, Bakugo was quiet. He was brooding. He was, for the first time in his life, recalculating. 

"I gotta say, I'm kind of jealous," Kirishima chimed in, leaning over his seat. "My Hardening Quirk is great for taking hits, but your Quirk is so flashy, Midoriya! You and Todoroki definitely have the most Pro-ready Quirks in the class."

Shoto Todoroki, sitting near the back, merely closed his eyes and said nothing. 

"We're here," Aizawa’s dry voice announced from the front. "Stop messing around."

The bus pulled up to a massive, dome-shaped facility that looked like something out of a science fiction movie. The class piled out, marveling at the sheer scale of the building. 

Waiting for them at the entrance was a hero wearing what looked like a marshmallow spacesuit. 

"The Space Hero, Thirteen!" Uraraka squealed, vibrating with excitement. 

"Welcome to the Unforeseen Simulation Joint, or USJ for short!" Thirteen greeted warmly. "Inside, you will find various disaster zones—shipwrecks, landslides, fires, and windstorms. Today, you will learn how to use your Quirks not to fight villains, but to save lives!"

Izuku listened intently. This was exactly what he needed. He had proven his combat capabilities; now, he needed to prove he could use his devastating power delicately enough to rescue civilians in precarious environments. 

The massive metal doors of the USJ opened, revealing a sprawling, multi-environment training ground. It was breathtaking. 

But as Class 1-A descended the main stairs toward the central plaza, the lights in the facility suddenly flickered and died. 

Izuku stopped dead in his tracks. His saurian hearing picked up a subtle shift in the air pressure before anyone else noticed. It was a low hum, like the tearing of static electricity. He turned his heavy, crested head toward the fountain in the center of the plaza. 

A small point of purple, swirling mist appeared in the air. It rapidly expanded, growing into a massive, shadowy vortex. 

"Gather together and don't move!" Aizawa commanded, his voice losing all its lazy drawl, instantly snapping into the sharp, authoritative tone of a seasoned combatant. "Thirteen, protect the students!"

"What is that?" Kirishima asked, squinting down at the plaza. "Is this like the Entrance Exam? Has the training started already?"

Out of the purple mist stepped a man covered in disembodied hands. Beside him was a massive, hulking creature with a terrifying, exposed brain and a beak full of jagged teeth. And behind them, pouring out of the vortex like a swarm of locusts, were dozens upon dozens of armed, dangerous-looking villains. 

"Don't move," Aizawa repeated, pulling his yellow goggles over his eyes and gripping his capture scarf. "Those are real villains."

The air in the USJ grew freezing cold. The students froze in terror. 

Izuku’s emerald eyes locked onto the hand-covered man. The man was scratching his neck violently, his red eyes scanning the students. 

"Where is he?" the man muttered, though Izuku’s sensitive hearing picked it up clearly. "The schedule we acquired from U.A. said All Might would be here. We brought the Nomu all this way... and the final boss isn't even here?"

They have the schedule? Izuku’s mind raced. This is a coordinated attack. They infiltrated U.A. They bypassed the sensors. They are here to assassinate the Number One Hero.

Before Izuku could process further, a mass of purple mist materialized directly in front of the students on the stairs. It formed into a tall figure with glowing yellow eyes. 

"Greetings," the mist villain said smoothly. "We are the League of Villains. It is a pleasure to meet you. I apologize for the intrusion, but we were hoping to draw All Might out. Since he is not here... I suppose we will have to scatter you and torture you to death to get his attention."

"Get back!" Thirteen shouted, opening the caps on their fingers to activate their Black Hole Quirk. 

But Bakugo and Kirishima were faster. The two teenagers lunged forward, Bakugo unleashing a massive explosion directly into the mist villain’s center. 

"Did we get him?!" Kirishima yelled through the smoke. 

"No! Move away!" Izuku typed furiously on his bracer, the robotic voice cutting through the chaos, but it was too late. 

The mist villain simply reformed around the explosion. "My, my. Such violence. You students are truly golden eggs. But it is time to separate."

The purple mist expanded violently, rushing forward like a tidal wave and entirely enveloping the students. 

Izuku felt a strange sensation of weightlessness, followed immediately by the rushing sound of wind and the sudden, shocking impact of freezing cold water. 

Izuku plunged deep beneath the surface of a massive lake. 

He opened his eyes, the salty water stinging slightly. Through the murky depths, he could see the silhouette of a large yacht floating above him. He had been warped to the Shipwreck Zone. 

He looked around. Plunging into the water nearby were Tsuyu and the diminutive Minoru Mineta. 

But they weren't alone. 

Surrounding them in the water were half a dozen villains, armed with tridents, harpoons, and aquatic Quirks. They were swimming rapidly toward the U.A. students, predatory grins on their faces. 

"Looks like we got some fresh meat!" a villain with shark teeth laughed, brandishing a rusty blade. 

Izuku didn't panic. He engaged his intellect. 

We are in water. I am wearing heavy combat gear. But... I possess the genetics of a Parasaurolophus. 

A lesser-known fact about the ancient hadrosaurs, one that Izuku had researched extensively, was their semi-aquatic nature. They were excellent swimmers, possessing massive lung capacity and powerful tails designed for propulsion. 

Izuku kicked his heavy boots, arresting his downward momentum. He didn't swim to the surface. He simply allowed himself to sink slightly, hovering in the middle of the villain encirclement. 

He reached up and unclasped his muzzle, slipping it onto his belt. 

Sound travels four and a half times faster in water than it does in air, Izuku calculated. Water is dense. It cannot be compressed. Therefore, an acoustic wave will not disperse as quickly. A concussive shockwave underwater is lethal; it will liquefy their internal organs.

Izuku couldn't use the Cretaceous Cannon. He would kill everyone in the pool. He needed something highly specific. 

He engaged his saurian transformation. His legs bulked, his tail erupted from his spine, providing incredible stability in the water. He drew in a breath, his lungs effortlessly extracting the remaining oxygen from his compressed chest. 

He looked at the approaching villains. He opened his mouth and let out a highly calibrated, low-frequency pulse. 

WUB-WUB-WUB-WUB-WUB.

It wasn't a roar. It was a sonar pulse, similar to the clicking of a dolphin or a sperm whale, but amplified to devastating levels. 

The acoustic wave rippled through the water at blistering speed. When the wave hit the villains, the effect was instantaneous. The sheer pressure of the low-frequency vibration attacked their inner ears and semi-circular canals—the center of human balance. 

The villains instantly clutched their heads, their eyes rolling back. Severe, debilitating vertigo struck them all simultaneously. They lost all sense of up and down, vomiting into their regulators and thrashing wildly before falling unconscious from the overwhelming sensory assault. 

The entire engagement lasted three seconds. 

Izuku swam upward, his powerful tail propelling him like a torpedo. He breached the surface, gasping for air, and grabbed Mineta and Tsu, tossing them effortlessly onto the deck of the yacht. Izuku pulled his massive frame over the railing, water cascading off his dark green armor. He snapped his muzzle back into place. 

"Midoriya!" Tsu gasped, clinging to the railing. "That was incredible! You took them all out without throwing a single punch!"

"We're gonna die! We're gonna die!" Mineta sobbed, clutching his purple, ball-shaped hair. "Those guys were trying to kill us! They're real villains!"

Izuku stood up, shaking the water from his crest. He walked to the edge of the yacht and looked down into the water. More villains were gathering, surrounding the boat. A massive villain with a Quirk that allowed him to control water was creating a whirlpool, attempting to suck the yacht down. 

Izuku raised his wrist bracer. [We cannot stay here. The boat will sink. Tsu, grab Mineta. Prepare to jump.]

"Jump where?!" Mineta shrieked. 

Izuku didn't answer. He stepped to the edge of the deck. He didn't take off his muzzle this time. He raised his heavy, acoustic-channeling gauntlets, pointing both palms downward toward the swirling water. 

He took a deep breath, channeling a burst of compressed air through his throat and into the directional speakers of his gloves. 

He fired. 

Two localized sonic booms erupted from his palms. The concussive force hit the surface of the water like twin missiles, instantly vaporizing a massive crater in the lake and violently disrupting the villain’s whirlpool. 

The sheer recoil of the blast launched Izuku backward into the air, flying in a perfect arc toward the shore of the Shipwreck Zone. 

"He's flying?!" Mineta screamed. 

"Grab on!" Tsu yelled, wrapping her long tongue around Mineta and leaping after Izuku. 

Izuku landed heavily on the concrete shore, his boots cracking the pavement. Tsu landed beside him a moment later. 

"That was amazing, Midoriya-kun," Tsu croaked, impressed. "You use the recoil of your soundwaves for mobility."

Izuku nodded sharply, but his attention was already elsewhere. 

From their vantage point on the shore, they had a clear view of the central plaza. 

What Izuku saw made his blood run cold. 

Aizawa, their tough, unyielding homeroom teacher, was on the ground. The massive, bird-brained creature—the Nomu—was standing over him. The creature had pinned Aizawa to the concrete and was systematically, brutally breaking his arms. The sickening crack of bone echoed across the plaza. 

The hand-covered villain, Shigaraki, was standing nearby, a sadistic smile playing on his lips. 

"Aizawa-sensei!" Tsu gasped, her eyes widening in horror. 

Izuku’s heart hammered against his ribs. The villains had brought a monster specifically designed to kill All Might, and Aizawa was taking the brunt of it. 

I have to go, Izuku thought, his saurian instincts screaming for a fight. I have to draw its attention.

He raised his bracer. [Stay here. Hide.]

"Midoriya, wait! You can't fight that thing!" Tsu pleaded, grabbing his arm. "It's too dangerous!"

Izuku looked down at the frog girl. His emerald eyes behind the visor were completely devoid of fear. They were burning with the cold, calculated fury of an apex predator. 

He pulled his arm away and launched himself toward the plaza, using his gauntlets to fire small sonic bursts to propel himself over the rough terrain at blistering speed. 

Shigaraki Tomura sighed, scratching his neck furiously. "Eraserhead. You're cool, you really are. But you're just a man. And this Nomu... is a bio-engineered nightmare. It has Shock Absorption and Super Regeneration. You never stood a chance."

The Nomu raised its massive, muscular arm, preparing to deliver a crushing blow to Aizawa’s skull. 

CH-THOOM!

A hyper-compressed bullet of pure sound struck the Nomu squarely in the side of the head. 

The force was immense. The Nomu was entirely lifted off Aizawa and thrown twenty feet across the plaza, tumbling like a ragdoll before crashing into the central fountain. 

Shigaraki flinched, turning his head. 

Standing fifty feet away, his heavy boots planted firmly on the concrete, was Izuku Midoriya. His right arm was extended, the acoustic gauntlet smoking slightly from the focused sonic blast. 

"Midoriya..." Aizawa groaned, his face bloodied and his arms shattered. "Run... you fool..."

"Oh?" Shigaraki turned his body entirely toward Izuku. The hand covering his face obscured his expression, but his tone was laced with dark amusement. "A student? And you managed to move the Nomu. That's a powerful Quirk. What are you, a dinosaur mutation? How boring."

Izuku didn't speak. He walked forward, placing himself directly between Shigaraki and Aizawa’s broken body. 

"Nomu," Shigaraki commanded lazily. "Kill the kid."

The Nomu stood up from the ruined fountain. It didn't look injured. The sonic bullet had hit it with the force of an anti-tank round, but its skin wasn't even bruised. The creature let out a guttural shriek and charged at Izuku with terrifying speed. 

Izuku dropped his stance, engaging his saurian hybrid form. His tail erupted, his legs shifted, and his scales locked into place. 

Shock absorption, Izuku analyzed rapidly, recalling Shigaraki’s words. It absorbs blunt force trauma. Concussive shockwaves will be useless. A Cretaceous Cannon might push it away, but it won't damage it, and it will kill Sensei in the crossfire.

The Nomu closed the distance instantly, throwing a massive punch aimed squarely at Izuku’s chest. 

Izuku didn't dodge. He planted his heavy feet and caught the punch with both hands. 

The sheer physical force of the Nomu’s blow was staggering. The concrete beneath Izuku’s feet shattered, his boots carving deep trenches as he was pushed backward. Izuku’s muscles screamed in protest, but his hybrid physiology held. He dug his tail into the ground, arresting his backward momentum. 

"You caught it?" Shigaraki muttered, actually sounding surprised. "Impressive physical strength. But it won't matter."

Izuku gritted his teeth behind his mask. The Nomu was stronger than him. He couldn't win a physical brawl. But he didn't need to. 

It absorbs external shock, Izuku thought, his emerald eyes locking onto the exposed brain of the creature. But shock absorption relies on the elasticity of the skin and muscles. It cannot absorb what bypasses the exterior entirely.

Izuku pulled his muzzle off with a swift motion of his left hand, letting it drop to the concrete. 

He didn't pull away from the grapple. Instead, Izuku pulled the Nomu closer. 

He drove his head forward, burying the massive, glowing tip of his bony crest directly into the center of the Nomu’s muscular chest. 

Izuku inhaled, narrowing his vocal cords to a microscopic slit, and unleashed a frequency he had never used in combat before. 

He unleashed "Hyper-Resonance."

It wasn't a roar. It was a high-pitched, incredibly intense, localized screech. The sound was so concentrated that it didn't travel outward; it traveled directly down the bone of his crest and injected straight into the Nomu’s body. 

Physics is absolute. The Nomu’s skin was designed to absorb physical blows, but it could not stop high-frequency acoustic vibrations from passing through it. 

The intense soundwave bypassed the Nomu’s exterior armor entirely and entered its chest cavity. Inside the Nomu, the acoustic wave bounced, multiplying in intensity. 

The water in the Nomu’s blood began to boil from the frictional heat of the vibration. Its internal organs—the heart, the lungs, the liver—began to violently oscillate. The resonance frequency matched the dense tissue of its muscles, causing them to spasm uncontrollably. 

The Nomu shrieked—not a roar of anger, but a sound of genuine, biological agony. 

It dropped its arms, stumbling backward away from Izuku. It clutched its chest, black blood suddenly violently erupting from its beak and its exposed brain. Its super regeneration was trying to heal the internal tearing, but the vibration was shredding the cells faster than they could replicate. 

The creature fell to its knees, violently seizing on the concrete, entirely incapacitated by the internal destruction. 

Shigaraki stared, completely dumbfounded. "What... what did you do? The Nomu is designed to take All Might at 100%! How did you hurt it?!"

Izuku stood tall, his crest slowly dimming. He coughed, a splatter of blood hitting the concrete. The Hyper-Resonance had severely burned his vocal cords. He couldn't speak. He simply stared at Shigaraki, a silent, imposing guardian. 

"You cheated," Shigaraki hissed, scratching his neck so hard blood began to draw. "You bypassed its Quirk! You damn NPC! Kurogiri! Warp this brat away!"

The mist villain appeared beside Shigaraki. "Tomura, we have a problem. The students who escaped the initial warp have alerted the authorities. And... someone is coming."

Suddenly, the massive metal doors of the USJ exploded inward. 

The heavy steel doors flew through the air, crashing into the central plaza. Standing in the entrance, devoid of his usual smile, was All Might. The Number One Hero was not radiating peace; he was radiating absolute, terrifying fury. 

"IT IS FINE NOW," All Might boomed, tearing his suit tie off. "I AM HERE."

In a blur of speed so fast the human eye couldn't track it, All Might descended the stairs. He grabbed Aizawa, scooped up Izuku, and retreated twenty yards backward in the blink of an eye. 

"Young Midoriya," All Might said, his voice deadly serious as he set the boy down gently. "Are you injured?"

Izuku shook his head, pointing a trembling hand at the seizing Nomu on the ground. He raised his bracer, typing with one hand. 

[The creature is incapacitated. High-frequency internal vibration. But its regeneration is fighting it. It will recover in a few minutes. Do not use blunt force. The villain said it has Shock Absorption.]

All Might looked at the bleeding, spasming monster, then back down at Izuku. A profound look of awe and pride washed over the hero's face. 

"You did this?" All Might asked softly. "You incapacitated the beast meant to kill me, without destroying the facility, and while protecting your teacher?"

Izuku nodded slowly, picking up his muzzle from the ground and snapping it back into place. 

All Might stood up, his muscular frame seeming to grow even larger. "Rest now, Young Midoriya. You have fought like a true hero. I will handle the rest."

"Nomu! Get up!" Shigaraki screamed, pointing at All Might. 

The Nomu, spurred by its master's command, forced itself to its feet, though it was staggering heavily, black blood still leaking from its eyes and mouth. 

All Might charged. 

What followed was a display of power that shook the very foundations of the USJ. All Might engaged the injured Nomu in a flurry of blows. Izuku watched closely, analyzing the fight. 

Shock absorption has a limit, Izuku realized, watching All Might punch the creature faster than it could heal. I weakened its internal structure. Its muscles are torn. It can't absorb the kinetic energy efficiently anymore.

"PLUS ULTRA!" 

With a final, devastating uppercut, All Might launched the Nomu into the air, entirely smashing it through the reinforced glass dome of the USJ and sending it flying into the stratosphere. 

Silence descended on the plaza, broken only by the heavy breathing of the Number One Hero. 

Shigaraki stared at the shattered dome, his body trembling with rage. "You cheated... all of you cheated... this is game over."

Kurogiri wrapped his mist around Shigaraki. "We must retreat, Tomura. The Pro Heroes are arriving."

The sound of sirens echoed outside the facility. Shigaraki glared at All Might, then shifted his gaze to Izuku. 

"You... the muzzled freak," Shigaraki hissed through the mist. "I won't forget you. Next time, I'll bring a monster just for you."

The mist collapsed, and the villains were gone. 

Izuku felt his adrenaline crash. His knees buckled, and he collapsed onto the concrete. The pain in his throat was excruciating, a sharp, burning agony that radiated down into his chest. His saurian muscles ached, and his crest throbbed with a dull headache. 

"Midoriya!" 

Kirishima, Uraraka, and Tsu ran down the stairs toward him, closely followed by the arriving Pro Heroes. 

All Might knelt beside Izuku, placing a massive, warm hand on the boy's shoulder. 

"You did well, my boy," All Might whispered, deflating slightly into his skeletal form, hidden from the view of the other students by his cape. "You did perfectly."

Izuku closed his eyes, leaning into the touch of his mentor. 

He had faced true villains. He had fought a bio-engineered nightmare. And he hadn't lost control. He hadn't destroyed the world to save it. 

The boy who was terrified of his own voice had just used it to silence monsters. The apex predator had arrived, and he was a hero.