Chapter Text
The facility—if one could call a subterranean, concrete-encased nightmare a "facility"—did not operate on the rhythms of the world above. There was no sunrise. There was no cycle of dusk turning into the velvet dark of night. There was only the hum: a low-frequency vibration that seemed to emanate from the very bedrock of the earth, a sound that lived in the marrow of Izuku’s bones.
He lay on the reinforced steel slab of his containment cell, his chest heaving with every ragged, superheated breath. He was eighteen years old. Or at least, his internal calendar said so. He had stopped counting by birthdays years ago, when the white coats had stopped being people and become merely extensions of the sterile, unforgiving machinery that defined his existence. He counted the passage of time by the number of times they broke him, and the agonizing, singular horror of the number of times his body refused to stay broken.
"Subject 0-1, vital signs are climbing into the red zone," a voice crackled over the overhead speakers. It was Dr. Ujiko’s voice—dry, clinical, and possessing a terrifying indifference that felt like a surgical blade pressed against Izuku’s throat. "Initiate the stabilization shunt. The radiation output is destabilizing the secondary containment grid."
Izuku’s teeth bared—a sharp, serrated sound that scraped against his own gums. He didn't need the machines to tell him his levels were rising; he could feel it. The radiation was a golden-blue fire behind his ribs, a secondary heart that beat in a fractured, chaotic rhythm against his human one. It was a furnace that never went cold, a volatile, seething mass of energy that yearned for release, for expansion, for destruction.
His tail, a heavy, muscular appendage tipped with ridged, armor-like plating that felt like an extension of his own vertebrae, lashed out in the narrow confines of the cell. It slammed into the reinforced concrete wall with the force of a battering ram, the sound of cracking masonry echoing like a gunshot. Four years ago, the tail had been a vestigial stump, a cruel byproduct of the initial mutation sequences. Two years ago, it had been a whip. Now, it was a weapon—a prehensile limb that possessed more raw strength than the rest of his body combined.
"Stop," Izuku rasped. His voice was a ruin, a gravelly, unfamiliar sound. He hadn't spoken to a human soul in weeks, his only company the flickering shadows of the Nomu in the adjacent, dark cells. They were his brothers in misery, though they lacked the spark of awareness that made Izuku’s suffering a slow, deliberate torture. "It’s... it’s too much."
"It is never 'too much,' Izuku," the voice of All For One resonated, not through the tinny speakers, but as if it were vibrating directly inside the cavity of Izuku’s skull. The silhouette of the man in the suit was unmistakable, standing behind the reinforced glass of the observation deck. He was a shadow made flesh, a void that drank the light of the room. "You are not a boy. You are a miracle of science. You are a god trapped in a cage of fragile, pathetic human flesh."
A searing, white-hot pain lanced through Izuku’s spine. The dorsal plates—sharp, obsidian-like shards that had begun to pierce through the skin of his back months ago—started to glow. The air in the room ionized, turning thick and metallic. The hair on his arms stood on end, and the scent of ozone—the smell of a world being burned to ash—filled the small, windowless space.
He tried to suppress it. He tried to think of his mother, though her face had grown blurry, like a photograph left in the sun for too long. He tried to think of the forest, the green of the trees, the feeling of a wind that didn't smell like antiseptic and the burnt hair of failed experiments. He clung to those memories like a drowning man clutching a piece of driftwood.
Focus, Izuku, he told himself, the mantra becoming his only barrier against the descent into pure, feral instinct. Human. Be human. Don't let the fire take you. Don't let the monster win.
But the instincts were a tidal wave, and he was nothing but a speck of sand. The predator inside him—the one that knew exactly how much force it would take to tear through the reinforced door, the one that could sense the terrified heart rates of every guard stationed in the hallway, the one that viewed the world through the prism of dominance and survival—was hungry. It wasn't hungry for food; it was hungry for the release of power.
"The conditioning is slipping," a lab tech whispered in the background, his voice trembling. "He's resisting the suppression, sir!"
"Adjust the neural inhibitor," All For One commanded, his voice devoid of empathy, like a god discussing the repair of a broken clock. "Increase the output by 15 percent. We need him malleable for the USJ. The Symbol of Peace must see what a true monster looks like when it is unleashed."
Izuku screamed, but it wasn't a human scream. It started deep in his diaphragm, a guttural, sub-sonic roar that vibrated through the floorboards and rattled the teeth of everyone watching from the other side of the glass. As the neural inhibitor spiked, the room flickered with an intense, atomic-blue light, casting long, distorted shadows that seemed to dance in the corners.
His claws, sharp and blacker than the darkest night, dug into the heavy steel of the table. The metal groaned, a high-pitched, screeching sound as it buckled and crumpled under his grip. His eyes, once a vibrant, hopeful green, were now eclipsed by a burning, radioactive luminescence that seemed to pierce through the walls of his reality.
He was being hollowed out. They were pouring the power of a geological catastrophe into him, and they expected him to be a puppet. They were forging a King of Monsters in the bowels of the world, and they were too arrogant to realize that a king, even one in chains, eventually learns how to command the storm.
But as the dark wave of the inhibitor crashed over his mind, numbing the agony and suppressing the memories of the boy he had once been, Izuku clung to one singular, jagged shard of his own identity. It was a tiny, fragile spark, buried deep beneath the radiation, a whispered defiance that the inhibitor could not touch.
I am not yours.
The room plunged into darkness as the power grid surged and shattered under the pressure of his aura. In the heavy, suffocating silence that followed, only the persistent, rhythmic hum of his own internal radiation remained, echoing in the dark like a heartbeat waiting for a reason to stop.