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"We're not going down there."
Vera stopped at the top of the subway stairs. The entrance gaped like a mouth, dark and wet. No emergency lights. No sound.
Mark pushed past her. "We don't have a choice. The core's under the district. Lucas said the map routes through here."
"Lucas also said his memory glitches." She grabbed his arm. The bone spurs under his bandage pressed against her palm. "What if he's wrong?"
"Then we die and I wake up yesterday." Mark pulled free. "You coming or not?"
Lucas was already halfway down the stairs, phone light cutting a thin line through the black. "Signal's dead but the map cached. We go three stops east, take the maintenance tunnel, and we're under the archive building."
"How do you know that?" Vera's voice echoed down the stairwell.
Lucas didn't turn around. "I just do."
Mark followed him down. The air got colder with each step. Something smelled wrong, like ozone and rust. His right hand throbbed under the wrapping Vera had tied around it that morning. The bone spurs had grown another inch since the last reset. He could feel them trying to push through.
The platform was empty. No people. No trash. The tracks stretched into darkness on both sides.
"This way." Lucas started walking east along the platform edge.
"Wait." Mark grabbed his shoulder. "Where are the trains?"
"Stopped when the protocol went live." Lucas shook him off. "Keep moving."
Vera caught up, breathing hard. "I don't like this."
"You don't like anything." Mark kept his eyes on Lucas's back. The guy walked too fast, like he knew exactly where he was going. Like he'd done this before.
"Mark." Vera's hand found his wrist. "What if Lucas is protocol?"
"Then we're already dead."
Something moved in the tunnel ahead. A sound like metal scraping concrete.
Lucas stopped. His phone light swung left, then right. "That's not supposed to be here."
"What's not supposed to be here?" Mark's hand went to the knife on his belt. The bone spurs under the bandage started heating up.
"The lights."
Mark saw them then. Three pale blue orbs floating twenty feet into the tunnel. They didn't move like drones. They pulsed, slow and rhythmic, like breathing.
"Back up," Lucas whispered. "Slowly."
The lights didn't follow. They just hung there, watching.
Vera took one step back. Her shoe scraped the platform edge.
All three lights snapped toward the sound.
"Run."
Mark didn't ask questions. He grabbed Vera's hand and ran. Lucas was already ahead, his phone light bouncing wild across the tunnel walls. Behind them, the blue lights shrieked, high and mechanical, and Mark heard the scrape of metal on stone getting closer.
"The maintenance door!" Lucas's voice bounced off the curved walls. "Fifty feet!"
Mark risked a look back. The lights were twenty feet away now, and he could see what carried them. Not drones. Not machines. Something with too many legs and a body made of segmented metal and wet tissue. Protocol hunters.
Vera stumbled. Mark yanked her forward.
"There!" Lucas reached a rusted door set into the tunnel wall. He slammed into it shoulder-first. It didn't budge.
"Move." Mark shoved him aside. His right hand was burning now, the bone spurs pressing against the wrapping like they wanted out. He ripped the bandage off.
Vera made a sound. "Mark, your hand—"
The spurs had grown into claws, white and sharp, curving out from his knuckles. He didn't have time to think about it. He drove his clawed hand into the door seam and pulled.
The metal screamed. The door tore open.
"Inside. Now."
Lucas dove through. Vera followed. Mark turned to see the hunters ten feet away, their lights blazing, mandibles spreading wide enough to swallow a head.
He jumped through the door and slammed it shut. Something hit the other side hard enough to dent the metal outward.
"That won't hold." Lucas was already running down the maintenance tunnel. Emergency strips lined the ceiling, flickering red.
"Where does this go?" Vera's voice was shaking.
"Somewhere safe. I think."
"You think?" Mark caught up to him. "You said you knew the route."
"I do. I just—" Lucas stopped. His eyes went unfocused for a second. "I remember this part different."
Behind them, the door started tearing.
Mark grabbed Lucas's jacket. "What do you mean, different?"
"I mean I've been here before but it's wrong. The door was supposed to hold. The hunters were supposed to—" He blinked hard. "Forget it. Keep moving."
They ran. The tunnel branched three times. Lucas took each turn without hesitating, like he was following a map only he could see. Mark's clawed hand dripped something that looked like bone marrow. Vera stayed close, her breathing too fast.
The tunnel opened into a wider space. Some kind of junction room, pipes running up the walls, a ladder leading to a hatch above.
Lucas stopped so fast Vera almost ran into him.
"What?" Mark scanned the room. Nothing moving. No lights. No sound except their breathing.
Lucas pointed at the far wall.
Someone stood there. A figure in a dark hood, hands in pockets, perfectly still.
"Who the hell—" Mark started forward.
The hunters' shriek echoed from the tunnel behind them.
The hooded figure moved. Fast. Too fast. It crossed the room in three steps and raised one hand. Something small and silver dropped from its palm.
The hunters' lights went out. Just like that. The shrieking stopped.
Silence.
Mark's claws were up, ready. "Who are you?"
The figure didn't answer. It just stood there, five feet away, hood shadowing its face.
"Answer him." Vera's voice came from behind Mark. She had a piece of rebar in her hand now. Where she'd gotten it, he didn't know.
The figure tilted its head. "Subject 447." The voice was wrong. Too smooth. Not male or female. "You've adapted faster than the last cohort."
Mark's chest went cold. "I never told you my number."
"You didn't need to." The figure reached up and pushed back its hood.
A woman's face. Mid-thirties, maybe. East Asian features, short dark hair, eyes that looked tired and angry at the same time. She wore something that looked like tactical gear under the cloak, but the material was wrong, too smooth, like it wasn't fabric.
"My name is Erin Sun." She looked past Mark to Lucas. "And you've already lied to them twice today."
Lucas went pale. "I don't know what—"
"You remember every reset." Erin's voice didn't rise but it cut through his protest like a blade. "You've watched him die six times and you keep steering him toward the same trap."
"That's not—" Lucas backed up. "I'm trying to help."
"Then tell them why your memory doesn't glitch." Erin stepped closer. "Tell them why you know the route. Tell them what you are."
Mark turned on Lucas. "What is she talking about?"
Lucas's hands came up. "Mark, listen—"
"Tell him," Erin said, "or I will."
Lucas's jaw worked. His eyes went to Mark, then Vera, then back to Mark. "I'm protocol staff. Low level. I was just supposed to monitor you, make sure you followed the optimal evolution path, and report back to—"
Mark hit him. His clawed hand caught Lucas across the jaw and sent him sprawling into the wall. Blood sprayed across the concrete.
"Mark!" Vera grabbed his arm.
He shook her off. "How many times have I died?"
Lucas spit blood. "Six."
"How many times did you let it happen?"
Lucas didn't answer.
Mark raised his clawed hand again. The bone spurs were growing, pushing further out, and part of him wanted to let them. Part of him wanted to see what they'd do to Lucas's throat.
Erin's voice cut through the rage. "He's not your enemy."
Mark didn't lower his hand. "He just said—"
"He said he was protocol staff. Was. Past tense." Erin moved between them. "He stopped reporting three resets ago. That's why they sent the hunters. They're not looking for you. They're looking for him."
Mark's claws were shaking. "Why should I believe you?"
"Because I helped design this protocol." Erin pulled something from her pocket. A small black card with silver text that shifted and moved like liquid. "I know what they're doing to you. I know what they want. And I know how to stop it."
Vera's voice was quiet. "How do you know Mark's number?"
Erin looked at her for the first time. "Because I chose him."
The words hung in the air.
Mark's hand dropped. "What?"
"Subject 447 wasn't random selection." Erin's tired eyes came back to him. "You were flagged eight months ago. Optimal stress response, high pain tolerance, low social attachment. Perfect specimen for accelerated evolution protocol."
"You're saying you picked me to die?"
"I picked you to survive." Erin stepped closer. The silver text on the card in her hand pulsed once. "The protocol was supposed to run on death row inmates. Volunteers. But my supervisor wanted faster results, broader demographic data. He expanded the selection pool without authorization."
"How many people are in this zone?" Vera asked.
Erin's jaw tightened. "Forty thousand."
"How many are subjects?"
"Forty thousand."
The maintenance room went very quiet.
Mark's claws retracted slowly, sinking back into his knuckles. It hurt. He didn't care. "You're saying everyone in the district is protocol."
"Was. Most didn't survive the first evolution cycle. You're one of seventeen still adapting." Erin looked at Vera. "Sixteen now. She's starting to turn."
Vera took a step back. "I'm not—"
"Your left hand." Erin's voice was flat. "Check the webbing between your fingers."
Vera looked down. Slowly, she spread her fingers. In the dim red light, Mark could see it. Thin translucent membranes stretching between each digit, barely visible but growing.
Vera made a sound like she'd been punched.
"It accelerates under stress," Erin said. "You have maybe twelve hours before it's irreversible."
"Can you stop it?" Mark's voice came out rough.
Erin met his eyes. "If we reach the core, yes. If we shut down the protocol, all active evolution cycles terminate. You keep what you have now, but it stops progressing."
"And if we don't reach it?"
"Then in seventy hours, this entire district gets archived as specimen data and everyone inside dies." Erin tucked the card away. "Including the seventeen who are evolving into things that aren't human anymore."
Lucas pulled himself up off the floor. His jaw was already swelling. "Why are you telling them this?"
"Because I'm done watching test subjects die for a civilization that left this galaxy two thousand years ago." Erin turned to the ladder. "The core is six levels down. There are twelve hunters between us and the access point. You can come with me and maybe survive, or you can stay here and wait for the protocol to decide you've failed the trial."
She started climbing.
Mark looked at Vera. Her hand was pressed against her chest, fingers spread, staring at the membranes.
"Vera."
She didn't look up. "I'm turning into a monster."
"Not if we shut it down."
"You heard her. Twelve hours." Vera's voice cracked. "What if we don't make it?"
"Then I die and reset and we try again."
"You keep saying that like it's easy." She finally looked at him. Her eyes were wet. "What if the next reset changes you into something worse? What if you wake up and don't remember me?"
Mark didn't have an answer for that.
Lucas limped over. "She's right. Each evolution mod rewrites part of your neural structure. Eventually you won't be Mark anymore."
"How many resets do I have left?" Mark asked.
Lucas hesitated. "Three. Maybe four."
"Then we better not waste them." Mark grabbed the ladder. "You coming?"
Vera looked at her hand one more time. The membranes caught the red emergency light like wet plastic. She made a fist.
"Yeah."
They climbed. Erin was already at the top, waiting by the open hatch. The space above was darker than the tunnel, and colder.
Mark pulled himself through. He was in some kind of sub-basement, concrete floor slick with condensation, pipes running everywhere.
Erin closed the hatch behind Vera and Lucas. "From here we stay quiet. The hunters track by vibration and body heat. They're blind but they're fast."
"How do you know all this?" Mark asked.
"Because I wrote the hunter protocols." Erin pulled something from her belt. A slim device that looked like a phone but wasn't. The screen showed a three-dimensional map, red dots moving through it like blood cells. "I know how they think because I taught them how to hunt."
She started walking. The map's glow barely lit the space five feet ahead.
Mark followed. His hand was bleeding again, the claw wounds leaking something clear and thick. Behind him, Vera's breathing was too loud. Lucas stayed at the back, silent.
They'd gone maybe fifty feet when Erin stopped.
Mark almost ran into her. "What—"
She raised a hand. On her device, three red dots converged ahead of them. Another two coming from the left. One from behind.
"They're boxing us in," she whispered.
"Can we go around?" Vera's voice was barely audible.
Erin's jaw tightened. "No."
"Then what?"
Erin looked at Mark. Her eyes went to his clawed hand, then back to his face. "How much control do you have over that?"
"I don't know. It just happens when I need it."
"Good. You're going to need it now." She pointed at the darkness ahead. "When they come, aim for the lights. The photoreceptors are the only weak point. Crack those and they go dormant."
"How many times have you done this?" Mark asked.
Erin's expression didn't change. "Once. I died forty seconds in."
The first hunter's shriek cut through the dark.
Erin's device went dark. "Move."
They ran. The shrieks multiplied, coming from every direction. Mark's claws extended without him thinking about it, bone pushing through skin, and this time it didn't hurt. This time it felt right.
Something fast and metallic rushed past his head. He swung blind. His claws caught something solid. The impact shuddered up his arm. Blue light exploded in his face and he saw it, the hunter, all segmented limbs and wet organic core, mandibles wide enough to take his head off.
He drove his claws into the light.
It shrieked and went dark.
Another one hit him from the side. He went down hard, concrete slamming into his ribs. Mandibles closed around his shoulder. He felt them puncture skin, scrape bone.
Vera screamed his name.
He got his clawed hand up and dug into the thing's photoreceptor. It spasmed and released him.
Someone pulled him to his feet. Lucas. Blood running down his face from a gash above his eye.
"Go!" Lucas shoved him forward.
They ran. Mark counted four more hunters in the dark. Erin moved through them like she could see, her hands empty but every time a hunter got close something happened and it fell away shrieking.
Ahead, a door. Metal. Sealed.
Erin hit it running and the door recognized her. It slid open.
They tumbled through. The door sealed behind them.
Silence.
Mark lay on his back, breathing hard. His shoulder was bleeding bad. Vera crawled over to him, her hands shaking.
"Let me see."
He didn't stop her. She tore his shirt open. The puncture wounds were deep but already closing. He could feel something moving under the skin, knitting tissue back together.
"That's not normal," Vera whispered.
"Nothing about this is normal." Mark sat up. His claws were still out. He watched them slowly retract into his knuckles, leaving bloody holes behind.
Erin stood by the door, her device out again. She was scrolling through something. "We're close. One more level."
"Then what?" Mark asked.
Erin looked at him. "Then I show you what you really are."
"I'm a delivery driver."
"No." Erin's tired eyes held his. "You're Subject 447. You've died three times already. And every time you reset, you remember less of who you were before."
Mark's chest went cold. "What are you talking about?"
Erin pulled off her glove. Her right hand was covered in bone spurs, white and sharp, exactly like his.
"Because you're not the first person I chose," she said. "You're the fourth. And the only one who's made it this far."