The hall around them was a wastewater saint’s reliquary, all blunt geometry and industrial prayer. Thick pipes ran like ribs along the ceiling, sweating condensation. Vats and filter-stacks hunched in rows, half-swallowed by shadow. Warning lumen-strips strobed amber over slick floors where brackish water and runoff pooled in shallow lakes, their surfaces filmed with oil and chemical rainbow. The air tasted of rust, disinfectant, and something older, sourer, alive in the dark.

  Ferrocrete came down in massive slabs, each impact answering the last with a deeper, uglier note. Angron had the Patriarch by the throat, one huge fist locked like a collar of iron, and he drove the four-limbed beast into the wall again and again with the brutal rhythm of a man testing the strength of masonry.

  Dozens of purestrains swarmed the demon primarch’s frame. They clung to him like pale, furious barnacles, claws scrabbling for purchase in red flesh that refused to behave like meat. Teeth sank in. Talons raked. They should have been eviscerating a tank. Instead they were decorating a hurricane.

  And the cultists kept coming.

  They spilled from the entrance in a tide of rags and icons, faces lit by muzzle-flare and fanaticism. Weapons fire lashed Angron’s side in frantic, devotional bursts. Lasbolts stitched sizzling lines across his torso. Autogun rounds sparked and flattened. A rocket screamed past close enough to ruffle wing-membrane and detonated in a gout of dust and shrapnel that briefly turned the world into a thunderclap. Plasma flared like a captured star, melta hissed its white-hot hunger, flamers coughed sheets of fire that made the wet air snap and spit.

  Angron didn’t even look at them.

  His attention was a private thing, reserved for the creature in his hand.

  The Patriarch wasn’t a helpless trophy. Its upper limbs sawed at the wrist locked around its throat, claws scraping grooves into the primarch’s forearm with the persistence of a machine. One lower claw worked at keeping Angron’s left arm busy, parrying, hooking, interrupting. The other reached for the soft promise of the abdomen, carving hot, shallow furrows that bled black ichor. That ichor hit the mucus-slick floor and steamed, ugly and quick, like insult meeting insult.

  Yet Angron only smiled.

  It wasn’t berserk glee.

  This was worse.

  This was amusement, bright and intimate, as if he’d found a toy that squealed in a new way. He avoided the clean, ending blows with deliberate care, turning lethal instinct into restraint, because restraint made the game last longer.

  Angron spun, wings beating once, stirring the mist into spirals. He stepped in and hip-threw the Patriarch away with casual mastery.

  The impact cracked the ferrocrete in a spiderweb that raced outward beneath them, and the whole floor gave a tired, unhappy groan. Pipes burst. Conduits tore free. A manifold tore loose with a shriek like a dying animal, and a curtain of brackish water and reagent slurry cascaded down, adding fresh slickness to an already treacherous floor. Chemical stench bloomed, sharp enough to bite the tongue. Somewhere a pump kept trying to run, choking and grinding, desperate to pretend the world was still normal.

  The Patriarch rolled with it.

  It hit, flowed, and was upright in the same breath, claws flared wide as it charged straight back at him, a pale purple comet of muscle and malice. Angron waited until the last moment to move, hips and shoulders turning his bulk aside with insulting ease, letting the lashing claws skim past his ribs by a hair’s breadth.

  Surprise flickered across Angron’s features.

  The Patriarch had anticipated the dodge.

  Its left foot slammed into the floor like a piledriver, launching its body sideways into Angron’s flank. Both left-side arms drove their two-foot claws deep into red flesh, burying to the hilt with a satisfying squelch of meat being violently displaced. Dark ichor gushed, pattering across the puddled ground in thick drops.

  Angron’s response was immediate, simple, and personal.

  His fist smashed into the Patriarch’s jaw.

  The crack was wet, loud, and final in the way broken bones are. The alien skittered across the slick floor, claws gouging desperate trenches as it fought friction and momentum, coming to a halt in a crouch that was already becoming a stand. Torn flesh knitted. Shattered structure reasserted itself. The thing rebuilt its own face while looking at him.

  Angron’s gut wound was doing the same, hissing shut in a crimson mist that smelled of hot iron and rage.

  For a heartbeat, amid the roar of gunfire that pattered off his back like rain, and the scream of stressed genestealers, Angron simply watched the regeneration happen, eyes tracking with the interest of a craftsman finding a tool that doesn’t break when you throw it.

  Then his smile widened, all the brighter now that it had earned the right.

  A foe that could take a punch.

  A foe that could give one back.

  What fun.

  ...

  Behind stacked ribs of machinery and a curtain of dangling cables, Koron folded himself into the worst kind of shelter: the kind that only existed because something bigger hadn’t looked behind it yet.

  The chamber beyond was a cathedral built for industry and repurposed for slaughter. Gantries crisscrossed overhead like black spiderwebs. Thick coolant pipes ran along the walls in sweating bundles, their joints vibrating with every impact that rolled through the deck. Heat came in pulses, not a steady warmth, but a series of hot breaths that carried the bite of propellant, burnt insulation, and that sour-sweet, biological stink the cult left on everything it touched.

  Angron moved through it like a living war engine. Each step was a seismic insult that made loose dust jump from the rafters and sent shivers through the metal Koron was pressed against. Cultists filled the lower levels, a frantic tide of bodies and muzzle flashes, screaming prayers in voices that sounded like they’d been borrowed from someone else. Their fire broke against the demon-prince’s hide in sparks and sizzling streaks.

  Loud. Brave.

  Pointless.

  Koron’s eyes kept drifting to the escape hatch.

  It wasn’t a hatch anymore.

  It was a wound in the wall, torn open where Angron had ripped the ladder free like it was a toy and left the edges bent outward in jagged petals. The hole yawned into darkness, breathing a cold draft that smelled like old concrete and wet rust.

  On his HUD, Rover’s beacon still glowed: a steady little star crawling upward through rubble and collapsed infrastructure, methodical as a mole with a grudge.

  T-minus: 07:59.

  His fingers rested against a pipe for balance, and despite his best efforts, they trembled. Not much. Just enough that he could hear the soft rattle of metal on metal.

  Sasha’s voice slid across his thoughts in a hush that felt almost superstitious.

  ‘Think the big bastard will last long enough for us to escape?’

  Koron swallowed, throat dry from smoke and adrenaline. He watched Angron take a rocket to the back and barely bothered to turn his head.

  ‘No idea. Hence the hiding,’ he replied. His eyes flicked back to Rover’s timer, hoping that by staring at it, he might shame it into moving faster. ‘Can she move any faster? Eight minutes to the surface is eight minutes I would rather not spend in a room with two living blenders.’

  ‘She-it-’ Sasha caught herself, ‘Isn’t built for construction work. It’s a combat drone,’ Sasha said, and there was a faint, familiar bite to the phrasing, the way she always sounded when she was being practical on purpose. ‘So no.’

  Another rocket struck.

  The explosion punched a wave of heat through the chamber. Air turned into a physical thing for a heartbeat, a slap across the face. The overhead lights flickered and recovered, throwing strobing shadows across the machinery and turning the cultists into jittering silhouettes. Someone laughed like they were drowning. Someone screamed like they’d just realized they were already dead.

  Angron didn’t even flinch.

  ‘But,’ Sasha continued, and Koron felt her attention pivot, clean and sharp. ‘This does present us with a unique opportunity.’

  His HUD populated with a swarm of overlays: structural schematics dragged in from half-ruined blueprints, stress maps blooming across columns, chemical readouts and airflow vectors knitting themselves into a predictive haze. She highlighted load-bearing supports that vanished into the ceiling’s bulk. Above them lay an absurd weight of stone, metal, and forgotten architecture, the kind of mass that made engineers wake up sweating.

  ‘If the one that destroyed the Nyx is playing with his food long enough,’ Sasha said, ‘we can drop the entire ceiling down on top of them. Over a thousand feet of metal and stone should leave a dent.’

  Koron tracked the highlighted columns, then the sagging grime-streaked roofline, then the cultists below. They were still firing. Still shouting. Still choosing to stand here, even though every rational signal screamed at them to run.

  His gaze snagged on faces.

  Wide eyes. Slack jaws. Teeth that were too sharp when they turned and screamed. Hands that had too many joints, or not enough. A young woman with a ritual scar down her cheek who threw herself forward as if faith could substitute for armor.

  ‘…We might be able to reverse their mutations,’ Koron said, and hated himself for how small it sounded in the middle of all that noise.

  For a long moment, the silence of the link between them was the only quiet thing in the room. The war continued without their permission: gunfire, roars, the wet percussion of bodies hitting the deck, the constant shuddering complaint of the building holding itself together out of sheer habit.

  Then Sasha spoke, softer now, as though she was handling a cracked relic with bare hands.

  ‘I love that about you, you know that?’

  A little pixelated face appeared in the corner of his HUD, her dry humor vanished. Just Sasha, stripped down to the part of herself that didn’t pretend.

  ‘I love that you want a way out that doesn’t end in piles of bodies. I love that you keep looking for a door that isn’t made of violence. But—’

  The HUD zoomed in, isolating the cultists with brutal clarity. Their bodies became data. Their skin became camouflage. Heat signatures told stories that their faces tried to hide. She pulled up a helix of DNA and let it hang there like a verdict.

  Koron had to force himself to look at it.

  He already knew what it would say.

  Sasha knew he knew. She said it anyway, because she wasn’t going to let him build a sanctuary out of denial.

  ‘They’re not human, Koron. Their outer appearance is a shell. A mask designed to fool scanners and soften the eyes. Underneath, they’re all just variations on the purestrains.’

  Koron stared past the helix to the living, shouting, bleeding people it represented. The rage on their faces was real. The fear was real. The devotion was real. Even the pain looked honest.

  His hands curled into fists at his sides, knuckle servos creaking. He could feel the old instinct rising, the one that tried to save everything by refusing to choose. He could feel his mind circling the same damn, desperate argument:

  If I can fix it, I don’t have to kill it.

  He’d seen worse systems patched. He’d written protocols for pulling minds back from broken feedback loops. Machines. Places. People.

  Sasha watched the loop form, watched the guilt weave itself into a rope he could hang himself with. Something in her own emotional architecture tightened, and Koron could taste it through the link: regret, protective instinct, and that colder thing that lived under her kindness.

  She pulled up evidence she’d never wanted to show him.

  A new notification blinked at the edge of his vision, drawn from the far left corner of the chamber where alien mucus had collected in glossy piles. The stuff dripped in slow waves, thick as oil, catching the flicker of overhead lights like it enjoyed being seen.

  A wireframe pulse washed over it.

  A point of data resolved into a strand of DNA.

  Then another.

  Another.

  The HUD became a storm of identifiers, signatures flashing too fast to read individually, stacking into a number that climbed with quiet inevitability.

  ‘Sixteen thousand, seven hundred and forty-four unique genetic signatures,’ Sasha said. Her voice didn’t shake. It didn’t need to. ‘Many of them are families.’

  The sound Koron made wasn’t a word. It was his breath catching on something sharp.

  Even over the roars and the gunfire, he heard the soft screech of metal giving way.

  He looked down.

  His hand had crushed the pipe he’d been leaning on. The metal had split and folded, coolant misting out in a thin, glittering fog that vanished into the heat.

  Sasha’s presence slipped in again, smaller now. Not softer. Just closer.

  ‘Koron.’

  He didn’t look at her face on the HUD. He couldn’t. His eyes stayed on the cultists. On their mouths as they screamed. On the way they moved, too fast, too hungry, like puppets with too many strings.

  Her voice, when it came, sounded like it had been dragged out of her gut.

  ‘They eat children.’

  Something in him went still.

  ‘Don’t waste your mercy on monsters.’

  The part that tried to argue for later, for cures, for mercy-by-delay, went quiet.

  For the first time since he had awoken into this era of prayers and knives, he stopped pretending.

  He had been trying to be kind in a universe that mistook kindness for weakness, trying to build a bridge out of a warzone using broken pipes and good intentions. He’d been pretending there was time. Pretending the rot could be negotiated with, coaxed into something survivable.

  That pretense quietly died.

  The anger that arrived was not the hot, reckless kind. He felt clarity. A blade of it. An old, practiced thing, the sort of focus his people used when the alternative was extinction.

  He realized, with a strange calm, that he had been avoiding the wrong horror.

  The Imperium’s brutality was loud, ceremonial, proud. Easy to see.

  It could be argued with. Rationalized. Dragged kicking and screaming into something better.

  This?

  This was hunger wearing a human face.

  Somewhere in his memory, he saw small hands. Not a specific child, just the category of someone who should have been allowed to grow.

  You could not rehabilitate a mouth that learned the taste of children.

  He swallowed, and the motion sounded too loud in his own skull. His pulse did not quicken. It slowed, as if his body had finally been given permission to stop wasting heat.

  Then the part of him that had learned to survive in the dark stepped forward, and softly closed the door behind it.

  ‘Options.’

  The highlighted load-bearing columns appeared once more, only for Koron to toss them aside, surprise spiking across the link from Sasha as he did so.

  ‘No. We purge. All of it.’

  ‘How?’ she sent, and didn’t dress it up in wasted drama. Just the question, because she could feel his mind turning—six channels splitting open along grooves worn into him by darker eras, an engine roaring to full power.

  Koron tore into the problem.

  OBJECTIVE: Eradicate local Tyranid presence

  CONSTRAINT: Minimize civilian exposure

  CONSTRAINT: Prevent surface breach

  CONSTRAINT: Preserve critical infrastructure where possible

  CONSTRAINT: Survive

  The first lit the chamber in bone-white geometry. Columns became equations. Stress lines crawled along gantries. The ceiling’s weight wasn’t ‘above,’ it was a number hanging on tired joints, a patient held together by rust and habit.

  Collapse possible. Variables: supports, rebound, secondary failures.

  The second turned the air into a river. Heat plumes curled off muzzle flashes. Drafts bled through cracks. Every doorway and maintenance shaft became a throat, every corridor a lung, every fan a muscle that could be made to spasm.

  Flow paths. Dead zones. Choke points.

  The third ignored the room entirely and stared at what lived in it. Bodies became silhouettes of function. Too-fast joints. Wrong symmetry. Warmth where warmth should not be. A biological lie wearing a human face like a borrowed coat.

  Target class: invasive. Adaptation likelihood: high. Pain tolerance: irrelevant.

  The fourth watched the enemy as an intelligence, not a crowd. It tracked swarms like schools of fish, the way they avoided open sightlines, the way they always left themselves an exit. It sketched the Broodmind’s probable reactions: surge, scatter, burrow, regroup.

  If threatened, they will not flee upward. They will flood outward.

  The fifth looked for the humans. Not the ones with too many teeth. The ones who would suffer afterward. The people who needed water. The people who needed this facility to still be a facility tomorrow. The innocent who would pay for any ‘efficient’ solution with thirst, disease, and riots.

  Collateral cost unacceptable. Reduce. Reduce. Reduce.

  The last was just a clock with teeth. Rover at seven minutes. Angron as a rolling variable. Structural fatigue increasing with each impact. The window closing in real time, each second a bolt shearing apart somewhere in the dark.

  Decision window: 00:12. Commit within to maintain control.

  Six answers began to form.

  None offered mercy.

  ...

  The Broodmind was already strained to its limits.

  Its anchor screamed. Not in words, not in anything human, but in a raw synaptic shudder that rippled down every borrowed nerve in the cult. Teeth breaking. Bone warping. The Patriarch’s pain ran through the lattice like an electrical fault, forcing the whole gestalt to compensate, to brace, to reroute.

  Angron was a bonfire in the psychic dark. Loud. Hot. Obvious. A furnace you could not ignore because it was melting your face.

  The Broodmind threw itself at that fire. It tightened the swarm. It pushed bodies forward. It fed the fight with devotion and muscle and screaming certainty, because that was what it understood. Predator meets predator. Claws. Blood. Hunger.

  Then something else moved.

  A pressure behind its eyes. A shallow, sudden drop in the shared instinct that held the cult together. Like the tunnels themselves had inhaled and found a chill in the throat.

  The Broodmind paused in the middle of its rage and tasted the shape of an ending. Not for the Patriarch. For everything under it. For the swarm in the walls. For the faithful in the ducts. For the young and the old and the newly changed.

  It reached for the source the way it reached for prey.

  And found nothing to bite.

  There was a blank space in the pattern. A place where attention slid off like water off oil-slick stone. No heat. No emotion. No psychic scent. Just a quiet certainty moving through the infrastructure.

  Angron was still there, still roaring, still burning bright enough to blind.

  But the Broodmind felt the second threat anyway, and the terror of it was sharper because it came without spectacle.

  Fire in its face.

  And a blade of ice at its back.

  The swarm began to shift before it understood why. Hunters peeled away from the brawl, fanning out to find the source. Converging on the locus where the air and water and pressure lived.

  The Broodmind did not know the weapon.

  It knew, with ancient predator instinct, that it had just been reclassified as prey.

  ...

  Thread Two flashed a priority tag. Not a suggestion. A flag.

  Hazard systems present.

  Koron’s attention snapped sideways, past Angron’s blaze, into the facility's bones. He saw it as it had been built, long before cultists used it as a nest. He saw warning glyphs and redundant containment loops. He saw doors that were never meant to be opened without authorisation. He saw sections of the plant that existed for one reason only: to keep something lethal from becoming everyone’s problem.

  Sasha’s presence sharpened, following his line of thought.

  ‘Hazard controls?’ she said.

  ‘Yes.’

  ‘What are you thinking?’

  Koron’s eyes tracked a schematic overlay through the wall. A sealed container. An isolation junction to ensure chemicals were never allowed to meet. A series of massive storage tanks that still had their original tags, half-scoured by time and neglect.

  A safety system.

  ‘Tyranids are tough. But they are still aerobic.’ he sent back.

  A beat of silence on the link. Numbers moving behind her eyes.

  ‘...Cellular respiration attack.’ Sasha said. ‘Nasty.’

  Koron watched Angron in the distance, watched the cultists throw themselves at a thing that did not care. Then he watched a purestrain move, too fast, too smooth, slipping through bodies like a knife through cloth.

  ‘It’ll kill them quick. More merciful than they deserve.’

  Thread Five pulsed. Collateral. Infrastructure. Surface.

  Thread Four pulsed. Enemy response. Routes. Escape vectors.

  Thread Six pulsed. Time.

  The six threads began to collapse inward, one by one, not merging into fog but stacking into a single composite plan.

  If you find this story on Amazon, be aware that it has been stolen. Please report the infringement.

  CONVERGENCE INITIATED.

  MODE: exploit candidate.

  GOAL: permanence.

  RISK: unacceptable if uncontrolled.

  Thread Two laid out the sewers as a lung system. It highlighted choke points and dead pockets. It marked the places the infestation would concentrate, the places it would try to flee through, the places it would use like veins.

  Thread Four overlaid behavior on top of airflow. Where they would push. Where they would avoid. Where they would hesitate, because even monsters hesitate when something in the air tastes wrong.

  Thread Five did not argue for mercy. It argued for boundaries. It boxed the surface in red. It tagged the plant’s critical stages with hard do-not-cross markers.

  It did not care what Koron wanted.

  It cared what would keep other people alive tomorrow.

  Thread Six turned everything into a countdown, slicing seconds into decision limits. It set a hard schedule, not for drama, but because the world did not pause while he felt things.

  Sasha’s pixelated face reappeared in the corner of his vision, but it was smaller now, less playful. She was an operator on a bridge, not a friend in a quiet room.

  ‘Candidate solution marked dominant,’ she said. ‘Biological denial via existing hazard architecture.’

  Koron’s jaw flexed once.

  ‘Filter it,’ he sent. ‘Constraints.’

  Sasha did not ask which constraints. They were already on the stack.

  The plan tightened. Red exclusion zones multiplied across his HUD until the map looked bruised. Routes narrowed. Doorways became gates. Gates became a funnel, drawn not with ink but with probability and consequence.

  Four hundred meters deeper.

  Koron moved without hesitation.

  He ran, and gravity folded and released as he blinked between open points, each hop a clipped punctuation mark in the facility’s stale air. He tagged hardstops as he passed them, physical barriers he would need to disable. A valve wheel here. A manual lockout there. A rusted gate he forced open with both hands until it groaned and yielded.

  The wastewater hall swallowed his footfalls. Pipes ran overhead like ribs, furred with condensation. The floor sweated under a film of old runoff that never fully dried. Somewhere in the walls, pumps labored with the stubborn rhythm of dying machines, dragging the plant forward on momentum alone.

  The main control room waited at the end of the corridor like a forgotten shrine—intact, and left to rot.

  Grime coated every surface in a soft, greasy skin. Condensation had eaten the labels off the consoles until the buttons were anonymous lumps. Status lights blinked with no audience. The air smelled of damp metal, old disinfectant, and the faint, sour note of something biological that had learned this place and decided it belonged.

  Koron crossed the threshold and felt the building’s age in his teeth.

  He didn’t slow.

  He drove a dataslate into the console port with a practiced motion, docking the tool into its cradle. Data surged. Schematics, degraded logs, half-corrupted process trees. The system tried to do its job anyway, throwing up access challenges, an old guard raising a shaking weapon.

  AUTHORIZATION REQUIRED.

  INVALID INPUT.

  LOCKOUT ACTIVE.

  Sasha’s attention pressed close along the link, focused and razor-straight.

  ‘It’s still enforcing,’ she noted.

  ‘Good,’ Koron sent back. His voice stayed calm. Calm was cheaper than panic. ‘That means it still works.’

  The system threw up authentication walls, spitting errors like teeth.

  They didn’t breach the locks. They gutted the access layer and walked through the smoking hole.

  Status lines rolled down his vision in a harsh, indifferent stream.

  Pumps near failure threshold.

  Filters degraded.

  Multiple subsystems nonresponsive.

  Emergency containment partially functional.

  The plant should have been dead. It trudged on out of habit and inertia, refusing to fail cleanly.

  Koron didn’t care about any of that.

  He searched for what the facility kept behind locked icons and hazard glyphs. The things it stored for treating drinking water. The things its masters had forgotten how to weaponize.

  The results came back.

  Ammonium Thiocyanate: 24% remaining.

  Concentrated Sulphuric Acid: 16% remaining.

  Vapor density: settles low. Inverting stack fans—negative pressure held below the shafts. Constraint secured.

  Diffusion: projected three to five days, then scrubbers and time do the rest. Constraint secured.

  Corrosion profile: within tolerance for seals, pumps, and impellers. Constraint secured.

  He dumped the entire remaining stock into the system.

  Enough for a purge.

  Sasha went quiet for a fraction of a second. The only sign, a tiny hitch in the link.

  ‘You’re committing to this,’ she said.

  Koron’s eyes flicked to the constraint list. Then to the funnel he’d drawn through the sewers.

  ‘Yes.’

  His fingers moved across the console. Commands snapped into place. Routing logic rewrote itself. Interlocks screamed, then complied. Far below the UI, deep in the plant’s guts, old hardware answered like a beast woken from sleep.

  Somewhere overhead, sluices opened with a wet clank. Liquid began to move through lines that had not seen flow in years. Pressure shifted in the pipes. A low vibration rose into the floor under his boots.

  A warning symbol bloomed across his HUD. Then another. Then a column of them, stacking fast.

  Sasha’s voice returned, steady and close.

  ‘Routing now to burn off tanks.’ She said, flicking the commands through the system. ‘Raising temperatures to four-hundred fifty kelvin. Decomposition will occur in two minutes fifteen seconds, storage tank drainage will need to be opened manually.’

  ‘Understood.’ He replied. ‘Projections are reaching roughly twelve hundred PPM. Tyranid biology will not survive.’

  Koron stared at the console’s blinking warnings and half-dead safeguards, at a system that had been designed to keep people alive and was now doing its exhausted best to pretend it still knew how.

  The facility smelled like old water and hot metal. Like chlorine that had lost the fight. Somewhere deeper in the walls, pumps thudded with the slow, stubborn rhythm of a failing heart. The lights above the control room were an uneven yellow, buzzing softly, their housings filmed with grime. On the main display, hazard overlays stacked like accusations. Manual stopgaps. Pressure differentials. Emergency vent states. A whole structure saying, in a dozen different ways, please don’t make me do this.

  Koron felt the moment settle into him anyway, with the cold, simple finality of a locking pin sliding home.

  Sasha’s voice came through his neural link like a hand on his shoulder.

  ‘Purestrains detected.’

  Her attention snapped toward the edge of his sensor range. The HUD expanded without thought, feeding him the corridor as a wireframe: a long, square throat of concrete and pipework, slick with condensation and alien mucus. A dozen signatures sprinted through it, multi-limbed shapes moving too fast for anything that had bones to be allowed.

  ‘System is engaged,’ she continued, crisp now, focused. ‘Still need to open manual stopgaps.’

  Then, after a beat, her tone softened. The harshness smoothed at the edges, like she was trying not to bruise him.

  ‘You don’t need to fight them to win.’

  Koron’s jaw tightened. He felt it, always there, just beneath the surface of his mind. A predator made of code.

  ‘I know,’ he whispered. ‘But I need one alive to study.’

  He looked down the corridor.

  The purestrains came like a tide made of knives. They didn’t just run. They climbed as they ran, skittering along the floor, walls, and ceiling in a seamless, nauseating flow. Claws clicked against concrete. Mucus smeared in their wake. Their movement had the wrong kind of confidence, like they already owned the distance between them and his throat.

  Sasha’s presence hovered at the edge of a protocol barrier, digital fingers brushing it like she could feel the shape of temptation.

  ‘CQC is highly inadvisable without the combat suite,’ she warned, quiet and tight. Not fear, but rather protective caution that had learned, the hard way, what inadvisable looked like when it started screaming.

  Koron didn’t answer.

  He didn’t brace for the attack.

  He turned left.

  The stairwell rose in a narrow concrete shaft, its steps stained with years of chemical run-off and boot grime. Above, the storage burn-off tanks sat like fat metal lungs, built to vent poison into controlled fire rather than let it spread. A long time ago, this place had been engineered with a belief in safety. In procedure. In containment.

  Koron walked toward it at a steady pace, like a man leaving a meeting.

  His hand slid to his combat webbing. Two small matte-black orbs came free, cold and familiar in his palm. Tools. Variables. A physics argument with a fist.

  He flicked his wrist twice.

  The first orb sailed down the corridor in a smooth arc, clipping a dangling cable before dropping like a stone. The second went higher, bouncing off a pipe brace and snapping toward the ceiling line. Their trajectories weren’t luck. They were math made physical.

  Both struck the incoming pack.

  Thunk. Thunk.

  And the hallway’s rules failed.

  Gravity inverted with a snap you couldn’t hear so much as feel. Dust lifted in a startled breath. Loose bolts and debris jumped, then slammed.

  Koron had tuned these charges differently than he had for cultists. There was no gentle modulation, no careful boundary. No mercy in the parameters.

  Above, the field drove down, turning the ceiling into a crushing plate. Purestrains clinging there were ripped free and yanked toward the floor so hard their limbs didn’t have time to catch.

  Below, the second field drove up, hurling bodies toward the ceiling like they’d been fired from a cannon.

  Two opposing gravimetric vices met in the middle.

  A collision of inevitabilities.

  Chitin cracked first, spiderweb fractures racing across armored plates. Then softer matter obeyed the same unforgiving equation. Organs burst. Joints collapsed inward. Flesh split under pressures it was never meant to endure. The corridor filled with wet impacts and the sharp, coppery stink of blood hitting warm concrete.

  The charges bounced again.

  They didn’t explode. They ricocheted, lively and indifferent, skipping off wall and ceiling like pinballs in a machine that had decided the prize was extinction.

  Up.

  Down.

  Left. Right.

  Each inversion was a piston stroke. Each cycle a hammer-blow from a god that didn’t care what you worshiped.

  A dozen purestrains, nightmare killers built to carve through squads and tear men apart like paper, were reduced to wet ruin in seconds.

  Koron took three steps in the time it took for the corridor to become a butcher’s drain.

  His face didn’t change. Not because he didn’t feel it.

  Because if he let himself show it, he might stop. And stopping would get people killed.

  ...

  All save one.

  It hit the corridor like a thrown knife.

  The air was wet with rot and chemicals, slick with that familiar nest-stink, and beneath it all was the warm, irresistible thread of prey. Human. Sweat-salt. Breath. Blood waiting to happen. The purestrain tasted the vibrations through its feet as it ran, claws ticking and scraping, body flowing up the wall and back down without losing speed. Four arms opened as it gathered itself, mouth parting, teeth shining with saliva.

  The prey did something wrong.

  It stopped.

  It didn’t bolt. It didn’t flail. It didn’t beg the corridor for miracles.

  It just waited.

  A thrill went through the creature like lightning through bone. A clean certainty. This would be easy. This would be food.

  It leapt.

  The distance between them vanished. It could already imagine the throat spilling out, the warm collapse of the belly, the way the prey would fold when the important parts were opened.

  Claws flashed for soft places.

  And the prey moved.

  Not much. Barely anything. A half-step. A twist of shoulders. The kind of adjustment that should have meant nothing.

  Something thin and wrong shimmered in the prey’s hand.

  A little bulge in the world, as if the air had thickened into a clear, delicate skin.

  It felt harmless for the heartbeat it took to notice.

  Then pain bloomed, bright and immediate, and the purestrain slammed into the filth in a spray of mud and mucus, momentum spilling sideways. It whipped around instinctively, trying to reorient, trying to find purchase, and saw the absence where its right arms had been. Gone. Simply missing. Blood poured out in hot sheets, scenting the air with iron and dark sweetness.

  Hunger didn’t pause.

  The thing inside it that was bigger than thought shoved it forward anyway. Not words. Just the pressure of go, the same way a storm pushes waves toward shore.

  It attacked.

  Left arms only, swinging high and low, trying to make up for what had been taken. It slashed for chest and thigh, aiming to cripple, to slow, to pin. Its mouth opened again, and it hissed through teeth slick with spit and hate.

  The prey didn’t retreat.

  It waited until the purestrain had truly committed, until the strike was locked into the shape of inevitability.

  Then the prey wasn’t where it should have been.

  Not fast. Not a blur. No impossible trick.

  Just wrong.

  The corridor’s geometry lied for it. The purestrain’s instincts reached for the target and found empty air.

  And that thin, delicate wrongness shimmered again, wrapped around the prey’s arm and leg like a quiet promise.

  Pain cut through it. Not a wound it recognized, but an absence abruptly made real. The purestrain pitched forward and hit the ground face-first, mouthful of mucus and grit, vision splattering. It tried to rise, muscles firing, only for the effort to meet nothing, for its left arms were sheared off.

  As for its legs?

  Its legs were gone at the thigh.

  It screamed, raw and furious, the sound tearing out of it because it needed the world to know this wasn’t happening, because it needed the hive to feel the threat through the meat.

  Cold metal fingers clamped onto its lower jaw.

  The prey’s hand was wrong, wrong in a way that scraped the creature’s nerves. No warmth. No fear-sweat spike.

  Like the grip of winter itself.

  Its jaw ripped away with a wet crack. Teeth burst loose and scattered across the floor. The purestrain’s scream collapsed into gurgling air.

  A hand closed around its neck. It was lifted like a carcass. For one spinning heartbeat it was weightless, nothing but pain and blood and the nauseating realization that the prey’s calm had been real.

  Then it flew.

  It slammed onto the top of the control room with a heavy, final impact, body flopping uselessly in the filth.

  Below, the prey turned away, already looking past it, as if this had never been a fight at all.

  ...

  The storage level hit him like opening an oven as he flew out of the stairwell.

  Steam howled through ruptured vents in white, ragged plumes, thick enough to turn the world into shifting curtains. The air tasted of scalded metal and bitter chemicals, sharp enough that even through filters it scratched at the back of the throat. Somewhere close, liquid boiled in a way that sounded wrong, not like water, but like something viscous and angry, popping in wet bursts against the insides of steel.

  Koron cut his grav-plates.

  The familiar weight returned all at once. Boots rang on the catwalk with a hard, honest clang, and the vibration came up through his legs like a warning. Underfoot, the metal wasn’t just hot. It was stressed, flexing in tiny shudders as pressure waves rippled through the pipework.

  Around him stretched hundreds of storage vessels, each a towering cylinder with a two-hundred-ton belly, bolted into place like a forest of industrial giants. Their status lights strobed red and amber in frantic patterns. Displays spat error glyphs and collapsing numbers. The whole bank of containers seemed to be screaming—not with voices, but with alarms, buzzers, and the tortured whine of pumps trying to move fluids that were no longer behaving like the fluids they were designed for.

  Condensation ran down the tanks in sheets, catching the emergency lights and turning them into slick, oily mirrors. In the gaps between them, piping arched and twisted, a dense lattice of insulated lines and naked metal, some of it frosting, some of it blistering, all of it alive with heat gradients that looked like bruises across his HUD.

  Behind and below, his sensors lit again.

  More purestrains. Fast. Closing. Their movement read as spikes of violence in the data, a skittering swarm climbing toward him through access shafts and maintenance corridors. Cultists followed behind them, slower and noisier, their signals messy with panic, zeal, and that strange, communal certainty. As if some sliver of the Broodmind had finally decided he was worth attention.

  Even down there, far beneath this boiling mechanical lung, the world shook with another laughing roar. Angron. The Patriarch. A cage match made of gods and teeth, rattling the sewer foundations like a drum.

  Koron didn’t look back.

  He kept his eyes on the countdown.

  T-minus 00:42

  The number hung in the corner of his vision like a pistol held to someone else’s head.

  Sasha hovered in the edge of his awareness, quiet but close, her focus spread through the facility’s systems like fingers in a piano’s guts. She didn’t speak, and that alone told him how thin the margin was getting.

  Koron started moving.

  He ran the line of tanks like a man doing an inspection in hell, shoulders squared, breath measured, hands already mapping the next actions before he reached them. He grabbed a valve wheel that was hot enough to blister flesh and wrenched it open, muscle and metal strength turning protest into compliance. A hiss answered, a high, violent scream of gas forced into a route it had never been meant to take.

  He crossed two steps, ducked under a drooping cable sparking against a pipe brace, and slammed a cutoff lever down. Another line choked shut with a heavy clunk that reverberated through the catwalk. Somewhere nearby, a pressure gauge jumped hard, needle snapping up into the red.

  Alarms went from disciplined to frantic.

  A panel began flashing an emergency cascade, warnings stacking on warnings. Overpressure. Thermal excursion. Reactive contamination. The facility’s ancient safety logic begged him to stop, to revert, to return the system to the careful, obedient shape it understood.

  Koron ignored it.

  He forced the flow, rerouting and re-routing again, turning the maze of pipework into a funnel. Every time he opened one path, he closed two others. Every time the system tried to vent, he denied it and shoved the pressure down the line. He moved with the ruthless calm of someone who had already accepted what would happen if he failed.

  He hit the airflow bank—four industrial extraction fans buried in the duct spine above the tanks. Three answered immediately, blades biting into the steam with a deepening roar as the airflow reversed.

  The fourth fan jerked a quarter turn and died. His HUD flashed the draw: Power spike, no rotation. Backpressure climbing. A bearing swollen with heat and grime, refusing to give.

  Koron didn’t slow. He stepped in close and slammed the side of his fist into the housing as he passed, hard enough to send a shiver through the ductwork.

  The motor shrieked in protest, then the blades broke free and spun up hungry, pushing the steam down in a sudden, violent gust.

  He gave it one sharp nod—good enough—and moved on.

  Steam washed over him in a thick blast, beading on his armor and running off in hot rivulets. A bubble of boiling liquid thumped against the side of a tank and the metal rang like a bell. The catwalk shuddered as a pump seized and kicked back into life, screaming its own complaint in a grinding mechanical howl.

  T-minus 00:31

  Another tremor rolled up from below, distant but heavy, as if the whole world had laughed and stamped its foot.

  Koron’s jaw tightened. His hands didn’t slow.

  He turned one last valve, forcing the building’s chemical guts to obey his commands, and watched the central line’s pressure climb. The needle buried itself. The piping thrummed. The tanks around him shivered in place as if they wanted to walk away.

  Somewhere down the access shaft, claws scraped closer. The purestrains were climbing toward heat and prey and motion.

  Koron kept working anyway, eyes hard, shoulders set, as though the facility were just another machine that needed coaxing.

  As though the oncoming monsters were only another variable.

  As though thirty-one seconds was an eternity.

  And as the alarms wailed themselves hoarse, the gas gathered into the central run—dense, impatient, and hungry for open air.

  ...

  The Broodmind arrived the way a storm arrives.

  Not as a single mind stepping into a room, but as pressure through a thousand nerves. As appetite braided into motion. As certainty poured down through synapse-creatures and meat, riding claw and prayer alike.

  The climb up into the storage level was a steepening taste of warmth. Heat from overworked pumps. Sweat from cultist throats. The thin copper tang of fear. The purestrains led because they were built to lead. They flowed through ducts and maintenance shafts, limbs finding holds that didn’t exist for anything honest-boned. Behind them came the cult, a ragged spine of bodies and devotion, carrying their stolen hymns like lanterns.

  The room opened into industrial thunder.

  A forest of tanks rose into steam and strobes, vast cylinders sweating condensation in sheets. Catwalks cut between them like thin bones. Pipes knotted overhead, vibrating with pressure, hissing in bursts that fogged the air. Alarms screamed in shifting pitches, not warning so much as begging.

  And there, above it all, perched atop one of the tanks like a quiet insult to the chaos, was the prey.

  A small figure against towering metal. Cloaked in heat shimmer and steam-sheen, still as a bolted plate. Not hiding, but balanced on the curve of the tank as if the screaming machinery beneath him were only weather.

  The Broodmind tasted him through its children and felt something that did not fit.

  Not strength. Not speed. Not the usual sting of human defiance.

  A wrongness.

  A blank edge where the air should have carried more information.

  The purestrains didn’t hesitate anyway. Hunger does not negotiate. They poured out onto the catwalks, claws biting for traction, bodies low and fast. Their eyes locked on the figure above. Their mouths opened. Their limbs spread, already imagining the soft places.

  The cultists surged behind them, voices jagged, weapons raised, faith foaming at the mouth. Their devotion was loud. The Broodmind barely noticed it. They were useful noise. The real work was the claws.

  Koron didn’t move.

  He didn’t draw a weapon.

  He only watched from behind his helm’s vizor, calm as a man waiting for an elevator.

  Below him, deep in the pipework, something shifted in relief.

  The central line opened.

  For a fraction of a heartbeat, the Broodmind registered it the way a predator registers wind direction. A change in pressure. A new current. A fast-moving invisible thing flowing into the room like spilled ink.

  And then—

  Nothing.

  The world’s smell-threads snapped as if someone had cut a woven net. The rich tapestry of information that lived in scent and hormone and heat-breath simply vanished. The Broodmind felt it through the purestrains first, an abrupt absence where certainty had been.

  For half a second, it did not understand.

  A clean, shocked pause in the vast, hungry rhythm.

  The purestrains hit the leading edge of the cloud and their bodies betrayed them. Muscles that had been coiled into violence went slack. Claws lost their bite on the catwalk grating. Their leaps became stumbles. Their perfect predatory flow broke into ugly, wrong motion.

  One purestrain tried to snarl and produced only a wet, useless rasp.

  Another’s limbs twitched once, twice, then stopped.

  They didn’t die in a blaze of tooth and claw.

  They simply… turned off.

  A string of bodies collapsed across the metal walkways, piling in awkward heaps, tails and limbs tangled. Heads hit grating with dull clanks. Jaws hung open, drool stringing down toward the deck. Their eyes stayed wide, still aimed at prey that had ceased to matter.

  Behind them, the cultists ran into the same invisible wall and began to fall in waves, weapons clattering from slack hands. Cries cut off mid-syllable. Knees hit the deck. Foreheads struck railings. Faith did not help. Belief didn’t buy lungs.

  The Broodmind felt the synaptic chorus tear.

  Dozens of bright points snuffed in the same instant, and the feedback of their dying bodies echoed up the network like a shiver running across an ocean.

  It reached for them.

  It pushed.

  It demanded movement.

  But the flesh could not receive the will anymore. The meat was present, but the channel was gone. The cloud had stolen the room’s language and left only blank air.

  Above it all, Koron remained perched on the tank.

  Watching.

  Not in triumph.

  Just a man who had changed the variables and let physics do what swords could not.

  For a moment the Broodmind’s attention narrowed, a vast presence focusing through emptiness toward that single figure—toward the wrongness that did not smell like prey, did not behave like prey, and did not fear like prey.

  Then the cloud thickened. More bodies folded. More senses went dead.

  And the Broodmind, hungry and infinite, withdrew its pressure from this room of suddenly useless flesh…

  …already searching for a new throat to bite.

  ...

  Angron was laughing.

  Not the polite kind. Not even the sane kind. The sound tore out of him like shrapnel, bouncing off ferrocrete and pipework and the wet cathedral of the sewer-chamber until it became a thing in the air. A chorus. A drumbeat. A promise.

  The Patriarch fought well.

  That was the joy of it. The four-armed abomination had weight, leverage, hate. It had learned violence the way a shark learns water, and every time Angron kicked it into a wall hard enough to crater metal, it came back with claws searching for seams, for eyes, for throat. It was clever in the way beasts were clever. It didn’t beg. It just tried to win.

  Good.

  Angron dragged it close by the throat, forcing its feet to scrabble uselessly on slime-slick decking, and grinned as it sawed at his wrist. Sparks of pain flickered along his nerves like old memories. The Nails sang their sweet, awful hymn.

  Yes. Yes. This. This was what the world was for.

  Around them, cultists fired and screamed, their little guns chattering like angry insects. Purestrains swarmed, clawing and biting at his sides. Their teeth scraped across hide that had been tempered in wars older than their species’ current shape. They hurt, a little. Enough to be interesting. Not enough to matter.

  Angron planted his feet and swung.

  The Patriarch became a bludgeon. A living hammer. It smashed through bodies and railings and a section of pipework that burst in a hot spray, coating everything in a metallic mist. The chamber shuddered. Somewhere above, dust fell like grey snow.

  The Patriarch snarled and raked at him again, opening hot lines across his chest that wept black ichor. It tried to pull him down. It tried to put him on the ground where its children could swarm his eyes and mouth and make a feast of him.

  Angron allowed it.

  Just for a heartbeat.

  Just long enough to feel the weight of it. The strain. The joy of an opponent thinking it had found the lever.

  Then he stood back up anyway.

  The look in the Patriarch’s eyes in that instant was almost satisfying.

  The moment a predator realizes the thing it grabbed is not prey, and never was.

  Angron roared into its face and punched it into the wall again. The ferrocrete cracked in a spiderweb around the creature’s spine. It spat something wet and foul. Angron laughed harder.

  The air shifted.

  A thin current, sly as a thought. Threading through the chamber, riding the steam and the stink and the heat.

  The Patriarch noticed before Angron did.

  Its head jerked slightly, the nostrils flaring. Its eyes widened a fraction, not from pain but from confusion, as if a sense it relied on had been abruptly lied to. It tried to inhale again, deeper. Tried to taste the world.

  It twitched.

  Angron blinked, mid-laugh, the expression on his face turning from glee to irritation so fast it was almost comical.

  Almost.

  The Patriarch’s claws slowed. The precision bled out of its movement like water from a cracked pipe. Its lower arms dropped as if they had suddenly become too heavy to lift. Its mouth opened, and the hiss that came out was not a threat.

  It was empty.

  A soft, wet exhale.

  Angron held it by the throat, waiting for the next strike, waiting for the next clever trick, and felt the creature’s body go slack in his grip.

  For a heartbeat, he didn’t understand.

  Not because it was complicated.

  Because the idea was offensive.

  The Patriarch convulsed once, a full-body shudder. Its eyes rolled, still wide, still angry, still alive in the way a dead thing can look alive for an instant after the signal stops.

  Then it went limp.

  Dead weight. A broken puppet. A toy with its strings cut.

  Angron stared at it.

  The Nails did not like this. They did not sing. They snarled. They had been promised a feast and handed an empty plate.

  He shook the Patriarch once, hard enough to make its head snap. No response. No defiance. No rage.

  Just dead meat.

  Across the chamber, purestrains began to stumble, their movements turning sloppy and wrong, as if their bodies were forgetting the instructions. Cultists coughed and dropped to their knees, weapons clattering. The battle-noise around Angron thinned in odd pockets, like a fire starving of oxygen.

  Angron’s head lifted slowly, following the invisible thread of cause to its source. His eyes tracked vent paths, pressure ripples, the way the air itself changed.

  He could smell it. He was too far past human to be denied by something as petty as a poison. He could see the effect. Could taste the sudden lack of will in the swarm. The way the room’s violence abruptly lost its teeth—

  —and the Nails scraped, angry at the theft.

  Someone had done something clever.

  Someone had stolen his brawl.

  Angron’s hand tightened.

  Ferrocrete groaned under his hooves. The muscles in his forearm bunched, and the Patriarch’s neck crunched like old bone.

  He looked down at the corpse in his grip with a fury so pure it almost became calm.

  “No,” he rumbled, the word scraping out like a chain dragged over stone. “No. No. No.”

  He hurled the dead Patriarch aside. It slammed into the wall and slid down in a wet smear, already uninteresting.

  Angron turned, scanning the chamber with predator focus, eyes burning like coals in a furnace. He ignored the small things collapsing. Ignored the dying cultists. Ignored the sudden quieting of the swarm.

  His joy had been interrupted.

  His toy had broken.

  And Angron, in all his vast, hell-forged wrath, did not forgive the hand that snatched away his entertainment.

  His lips peeled back from his teeth.

  The laugh that came next was not happy.

  It was a promise of what happens when you ruin a god’s game.