The subterranean dome pulsed with a dim, sickly red light.

Thick crimson veins throbbed along the cavern ceiling, dripping yellow sap that hissed as it hit the stone.

The exits were sealed, fused into solid, calcified bone barriers by the shifting terrain.

Dozens of slaughtered lower-rank recruits littered the spongy moss, their standard-issue gray armor crushed flat into the digestive mud.

The heavy stench of hot sulfur and accelerated organic rot filled Caleb’s helmet.

The warped Danger Class-7 Mimic stood in the dead center of the graveyard.

Thick biological cables wove through its heavy steel plating, pumping luminous fluid into its synthetic muscle fibers.

Its featureless black dome angled toward the squad.

It raised its right hydraulic scythe.

"Dodge," Caleb ordered over the local comms.

He drove his boots into the slick biological membrane and threw his weight sideways, letting the custom ballistic weave carry him out of the kill zone.

BOOM.

The massive blade struck the bedrock exactly where Caleb had stood a fraction of a second prior.

The kinetic shockwave launched jagged shrapnel across the cavern.

Caleb hit the ground rolling.

His shoulder slammed hard into the crushed chest plate of a dead D-rank recruit.

The impact rattled his healing ribs, sending a sharp spike of pain down his spine.

Kikaru, Hiro, and Iharu scrambled backward.

They dove behind a horrific barricade formed by the severed limbs and melted surplus gear of the failed lower-rank push.

Yellow acid pooled around the discarded helmets, eating through the polymer with a quiet sizzle.

The Mimic pulled its blade from the stone.

The featureless black dome panned across the slaughterhouse. It stopped.

A voice projected from its internal speakers. The audio cut through the heavy breathing of the squad.

"Route Delta is collapsing," the creature broadcasted. It spoke with the stolen, garbled voice of the dead squad leader they had heard on the radio during their descent. Static laced the recording. "Man down on the right flank. I need covering fire."

The voice did not just play outward. The machine modulated the acoustic frequency, bouncing the sound waves off the curved bone walls. The audio seemed to originate from the dark corner directly behind a pile of crushed gear.

Iharu shifted his weight. The redhead grimaced, favoring the deep acid burn on his leg from the ravine trap. He leaned around a melted transport crate, raising his scatter-gun to aim at the empty right flank to protect the phantom caller.

The Mimic did not turn right. It anticipated the human reflex. It lunged left, tracking Iharu’s exact shift in cover. It drove its left scythe straight through the barricade of corpses.

Caleb grabbed Iharu’s tactical harness. He yanked the redhead backward into the dirt.

The blade sheared the space where Iharu’s head had just been. It buried itself deep into the mud, spraying black fluid across Iharu’s custom crimson armor.

"It wears human panic like camouflage," Caleb said. He kept his chest pressed flat against the yellow mud, tracking the massive shadow looming over the barricade. "Do not listen to it."

Caleb stared at the featureless dome.

The military classifications were completely wrong.

"It wears human panic like camouflage," Caleb said. He kept his chest pressed flat against the yellow mud, tracking the massive shadow looming over the barricade. "Do not listen to it."

Caleb stared at the featureless black dome. and thought to himself.

It used the dead gunner’s voice to force Iharu to cover an empty corner, leaving his flank wide open. The machine wasn’t blind. It hunted their reflexes.

Kikaru braced her white boot against a cracked concrete pillar to stabilize her stance on the slick terrain. She leveled her custom plasma rifle. She fired three precise armor-piercing kinetic rounds.

The bullets struck the Mimic’s central chassis. The thick biological cables weaving through the overlapping steel plates caught the kinetic shock. The organic cords pulsed, glowing a dull red as they absorbed the energy and regenerated the microscopic damage instantly.

Kikaru ejected her thermal clip. She slammed a fresh battery into the receiver.

"My doctrine covers heavy armor," Kikaru reported. Her tone remained clipped and disciplined, refusing to yield to the panic of the sealed room. "It does not cover a machine that bleeds. The hydraulic recoil is too massive for its warped chassis. It drops its center of gravity and anchors its hind legs before every heavy strike to compensate."

Caleb processed her tactical read. He scanned the floor of the dome. The stone was slick with coagulated black fluid and pooling digestive acid. He looked at the thick calcified bone wall sealing the cavern’s only exit. A hairline fracture wept yellow fluid near the center of the barrier.

Brute damage would fail. His unpowered surplus rifle lacked the caliber to pierce the upgraded plating. Kikaru’s kinetic rounds were useless against the regenerative cables. They had to use the room to break the seal.

"Hiro," Caleb ordered over the squad link. "Target the optical dome with cryo-rounds. Blind the sensors. Iharu, your leg is burned. Do not run. Plant your boots near the acid pool. Use the scatter-gun to block the left lane. Force it toward the center wall."

Iharu locked his jaw. He looked at his scorched shin guard, then at Caleb. Swallowing his pride, he dragged himself upright and hobbled toward the hissing yellow puddle. He racked the heavy pump of his scatter-gun, seating the stock against his shoulder.

Hiro elevated his rifle over the corpse pile. His hands shook slightly, but he sighted the featureless black head through his tier-two optics. He fired a localized freezing burst.

KRKK.

Ice crystallized rapidly across the Mimic’s smooth faceplate. The creature jerked backward, its primary sensory input temporarily severed by the extreme temperature drop.

Iharu fired. A heavy spread of kinetic slugs roared down the left corridor. The rounds sparked violently against the stone, denying the machine the flanking route.

The Mimic recalibrated. It turned its frozen dome toward the center of the room, tracking the audio footprint of the gunfire and the heavy vibrations of their boots.

"Route Delta requires heavier caliber," the garbled voice broadcasted. "Target acquired."

Caleb broke cover. He sprinted through the ankle-deep mud, stepping over shattered rifles and severed arms. He stopped directly in front of the fractured bone wall. He planted his boots in a wide puddle of slick black blood, ensuring his footing was centered exactly on the slickest patch of stone.

He raised his combat knife. He banged the steel hilt against his chest plate. The sharp clack echoed across the dome.

The Mimic charged.

The ground shook. The massive machine crossed the dome in three long strides. It reached Caleb. It dropped its center of gravity. It anchored its heavy hind legs into the slick stone, preparing to unleash its full payload.

It swung both hydraulic scythes in a massive horizontal arc.

The starvation behind Caleb’s ribs screamed. The hollow void cannibalized his remaining energy reserves, demanding raw calories to sustain his bruised shoulder and fuel his failing muscles. Nausea ripped through his stomach. He felt freezing cold from the inside out despite the oppressive, stagnant heat of the cavern.

He triggered his suit’s marginal kinetic multiplier. He threw his entire body weight under the sweeping blades.

The ballistic weave whined, strained to the absolute limit. A tearing pop echoed in his right shoulder as he overextended the joint to clear the strike zone. He hit the ground hard, sliding through the corrosive slime on his back.

The twin scythes missed Caleb. They slammed directly into the calcified wall behind him.

BOOM.

The blades buried themselves three feet deep into the bone structure. The creature’s hydraulic joints locked. It tried to yank the weapons free. Its anchored hind legs slipped on the puddle of black blood Caleb had positioned it over. It lost its leverage entirely. The heavy chassis lurched forward, driving the scythes deeper into the fracture.

The calcified structure buckled under the mechanical stress. The wall shattered.

A deluge of boiling mud flooded inward from the adjacent cavern.

SPLASH.

The corrosive wave washed entirely over the trapped Mimic. The highly acidic yellow sap melted the organic cables weaving through its steel plates. The beast thrashed, its stolen biological upgrades sizzling down to bare wire in the boiling sludge.

SKREE.

The grinding mechanical shriek rattled Caleb’s teeth. He forced his legs to work. He dragged his agonizing right arm, struggling upright in the shallow mud. The boiling sludge burned the edges of his canvas trousers, singeing the fabric near his boots.

"Move!" Caleb yelled.

Kikaru provided covering fire, shooting the remaining biological cables on the Mimic’s back to keep it pinned in the acid. Hiro grabbed Iharu’s tactical harness, hauling the limping redhead toward the fresh breach in the wall.

The squad scrambled through the jagged hole, stepping carefully over the melting chassis of the machine.

They crossed the threshold.

The suffocating heat and the pulsing red veins of the rupture zone vanished entirely. The air temperature plummeted to freezing. Caleb dragged in a breath of sharp, sterile oxygen. He raised his rifle with his good arm, scanning the new environment.

The tunnel on the other side was pitch black. The floor beneath their boots was perfectly smooth, obsidian glass. It lacked any organic growth, yellow sap, or biological decay.

The deployment map held no record of this structure. They had broken out of the dome into a completely unmapped sector.