Chapter 3: Borrowed Teeth

The rat’s body twitched once more, a last ugly message from nerves that had not yet realized the head was half-caved in.

Evan stood over it with the aluminum stock cart bar still clenched in both hands, chest pumping so hard it hurt. The grocery aisle around him looked like a riot and a slaughterhouse had been stuffed together and shaken. Shelves leaned at bad angles. A rain of cereal dust and shattered glass glittered under the emergency lights. Bleach from a burst cleaning bottle fought a losing battle against the copper-thick smell of blood and the wet sewer rot pouring off the thing at his feet.

The dead rat was the size of a motorcycle if someone had rolled the motorcycle in grease and then given it too many teeth.

Its hide was mangy in patches and armored in others, wiry black fur broken by islands of gray skin as tough-looking as old tires. One eye was crushed. The other stared upward, jaundiced and already clouding. Its incisors jutted from a lip curled in permanent hatred.

Evan couldn’t stop staring at them.

Maybe because those teeth had nearly gone through his forearm.

Maybe because the thing had come out of a floor drain that should not have been big enough to fit a cat, much less that.

Or maybe because the translucent blue pane hanging over the corpse was still there, patient and impossible, waiting for him to do something with it.

Carrion Rat Lv. 3 defeated.

Hidden function detected.

Dismantle Essence available.

He swallowed, and his throat clicked dryly.

“Okay,” he said to nobody, because the empty store and the overturned carts had been his only company for what felt like hours. “Sure. Why not. I killed a giant rat in a supermarket. Let’s make one more terrible decision.”

His own voice came back small in the humming dark.

Outside, beyond the blackened front windows and the steel shutters half-jammed down over the entrance, something boomed in the street. Not thunder. Impact. A car alarm answered from somewhere farther away, blaring in short panicked bursts before cutting off mid-wail.

The city had sounded wrong ever since the sky fractured.

Evan looked down at his trembling hands. Blood slicked his knuckles where the skin had split on the metal bar. His store uniform polo was ripped under one arm. The bite on his forearm wasn’t deep, but it throbbed hotly beneath a duct-tape bandage he’d wrapped in a hurry using supplies from aisle twelve. Every inch of him ached with the punishment of surviving something he never should have survived.

He should have felt lucky.

Instead he felt hunted.

The blue pane waited.

He let go of the bar with one hand and reached toward the prompt. His finger stopped an inch short.

If this opens the rat and sprays me with acid, I’m going to be so annoyed.

Then he jabbed the option.

The air over the corpse shivered. The effect wasn’t dramatic so much as wrong. The rat didn’t burst or melt. It came apart in layers of dim red wireframe and drifting black ash, like reality itself had decided to stop pretending this thing had ever been made of meat.

Evan stumbled back on instinct, knocking into a shelf of canned beans hard enough to make it rattle.

The corpse sank inward. Bone, fur, and muscle split into neat geometric seams. A core of light emerged from inside it, a pulsing clot the color of old rubies. Around that heart-flecked glow rotated thin symbols he couldn’t read but somehow half-recognized, as if they were trying to speak to a part of him behind his eyes.

Dismantling essence…

Available extracts:

• Feral Bite

• Filth-Adapted Digestion

• Night Scuttle

• Carrion Scent

Zero Slot anomaly detected.

Standard slotting unavailable.

Alternative routes:

• Graft to Self

• Condense to Fragment

• Purge

His breath caught.

For a second he forgot the pain in his arms and the cold sweat on his neck and the ruined world outside the store. He only stared at the list.

Skills. Traits. Whatever they were. The rat had dropped parts of itself like loot.

And the system—if it really was a system and not the planet’s most comprehensive nervous breakdown—had expected him to put one in a slot.

Everyone got a class, a level cap, skill slots. That was what the glowing notices in the sky had said. That was what people had screamed to one another in the parking lot before the first monsters came and turned panic into carnage.

Evan had gotten something else.

Name: Evan Mercer

Class: Zero Slot

Level: 1

Skill Slots: 0

Zero. Flat. Clean. Final.

He had stared at that number until a manager from electronics started laughing too hard and didn’t stop until one of the floating things of broken glass slit his throat open in the checkout lane.

Now the same glitched class had opened a hidden menu over a dead sewer beast.

Alternative routes.

He looked over the list again. Filth-Adapted Digestion made his stomach revolt on principle. Carrion Scent sounded like a curse. Night Scuttle sounded useful in a way that made him suspect he would regret every detail.

Feral Bite, though—

His gaze drifted to the rat’s incisors, still outlined in dissolving light.

He remembered the speed of the lunge. The force in the jaw. The way the thing had crunched through a plastic crate and almost taken his arm with it.

Weapon. Tool. Survival.

He needed anything.

“Graft to self,” he whispered, and even saying it made him feel stupid.

The window flashed.

Selected: Feral Bite

Warning: Biological integration may cause pain, rejection, or unstable mutation.

Warning: Zero Slot hosts exhibit elevated assimilation depth.

Proceed?

His heart knocked once, hard enough to hurt.

Elevated assimilation depth.

“That sounds fake enough to ignore,” he muttered. Then, because standing still was somehow worse than choosing, he stabbed Proceed.

The red core burst into a line of light and drove straight into his mouth.

Evan screamed.

It was not a metaphorical sensation. It was not a mystical warmth. It was an intrusion, invasive and vicious and immediate. His jaw snapped open so hard his teeth clacked. Fire poured into his gums. Something hooked under every tooth root at once and yanked.

He dropped to one knee in spilled rice and shattered glass.

His hands flew to his face. He felt wetness. Blood. More than blood. His teeth were moving.

Not loose. Moving.

He gagged. A molar shifted under his fingertips with a slick little crackle. Pressure built in his jawbones until it felt as if his skull were being inflated from the inside. He tried to spit and a ribbon of blood splashed the tile.

His vision whitened at the edges.

Integrating…

Foreign trait interface accepted.

Bone lattice adapting.

Musculature recalibrating.

Instability: 3%

“Stop,” he croaked. “Stop, stop, stop—”

Nothing stopped.

The pain went deeper. It spread into the hinges of his jaw, his tongue, the cords of his neck. He felt phantom maps unfolding in his head: how to clamp, how to tear, how to drive his bite with shoulders and spine instead of just teeth. Reflexes downloaded in ugly flashes. Hunger shivered through him that had nothing to do with food on shelves. A hot, feral certainty that flesh yielded if you bit the right place and did not let go.

He slammed his forehead against the floor by accident or instinct and made a strangled sound into the blood.

Then, all at once, the pressure broke.

He sprawled there panting, cheek against cold tile gritty with sugar and dust. Somewhere nearby a fluorescent fixture buzzed with insect insistence. His own pulse thundered in both ears.

He stayed down until the world stopped rolling.

When he finally pushed himself upright, strings of saliva and blood hung from his chin and dripped onto his shirt. His hands shook so badly he had to brace one against the shelf.

The window hovered in front of him.

Trait graft complete.

Acquired: Feral Bite (Common)

Your bite force, dental integrity, and jaw engagement have increased.

Minor predatory impulse package included.

Current Instability: 5%

“Minor,” Evan said hoarsely. “That was minor?”

His voice sounded wrong. A little thicker. Sibilants touched with a faint rasp.

He froze.

Very carefully, he raised trembling fingers to his mouth.

His front teeth were sharper.

Not cartoon-fang ridiculous. Not enough to split his lip. But the canines had lengthened, points more pronounced now, edges subtly altered. His molars felt broader, ridged. When he touched one with his tongue, he felt a fresh seam of soreness and a solidity that hadn’t been there before. Stronger. Embedded like they belonged in reinforced concrete.

He stumbled to the freezer section and found a chest freezer lid cracked open. The glass reflected him in warped dimness.

Pale face. Sweat-slick hair plastered to his forehead. Blood all over his mouth. Wide eyes too bright with adrenaline. And yes—when he bared his teeth, there it was. A grin made one degree too animal.

“Nope,” he said to the reflection. “No. Absolutely not. We’re not becoming whatever this is.”

The reflection bared those teeth right back, because of course it did.

He rinsed his mouth at a busted employee sink in the back room until the water ran pink, then clear. Every spit into the basin carried little strings of blood, but the pain had already dulled into a deep ache, the kind left by a dentist from hell. He tested his bite gingerly and felt muscles in his jaw flex with unnerving ease.

His stomach twisted. He’d had half a protein bar and two swallows of warm sports drink since the world ended. The smell of blood on his own shirt made something low in his body take interest.

Evan turned on the sink harder and scrubbed his face with hand soap until the skin burned.

“You are not a sewer raccoon,” he told himself. “You are not eating roadkill. You are not biting anybody.”

He looked up.

The blue interface was still there.

Zero Slot adaptation log available.

He blinked and selected it.

Another pane unfolded, denser than the others, packed with lines that felt half system message and half medical report.

Zero Slot / Assimilation Record

Integrated traits do not occupy slots.

Integrated traits alter host substrate directly.

Repeated grafting may enable recombination.

Repeated grafting may degrade host baseline.

Mutation thresholds apply.

Stabilization methods: unknown.

He read the lines twice.

Then a third time, slower.

Alter host substrate directly.

Degrade host baseline.

Recombination.

The words should have felt clinical. Instead they made his skin crawl.

He didn’t have slots because he wasn’t equipping abilities.

He was replacing parts of himself with them.

For a long moment he just stood in the dim stockroom listening to the compressors thrum and the far-off chaos of the city breathe through cracks in the walls. The shelves around him were stacked with what had survived the looters: dented canned vegetables, industrial paper towels, cleaning solutions, store-brand pet food no one had thought to steal. Ordinary things. The world before, fossilized in fluorescent aisles.

His jaw ached.

His pulse steadied.

A thought slithered in quietly and sat down.

If one rat trait did this, what would stronger monsters do?

The fear came first. Honest, immediate, human fear.

Then something else rose beneath it, ugly and electric.

Opportunity.

Evan shut his eyes.

This is insane.

This is disgusting.

This might be the only reason I’m still alive tomorrow.

He opened them again and looked at the remains of the rat’s dissolving frame. There was almost nothing left now but gray motes breaking apart like ash in a draft.

Three extracts remained unselected.

He hesitated over Night Scuttle. The name pulsed faintly, tempting and ominous.

He moved to Condense instead.

Selected extracts condensed to unstable fragments.

Obtained:

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