The slit behind the corruption leak spat them into a different kind of wrong.
Not rot-on-stone wrong.
Human wrong.
Sweat trapped in damp cloth. Old piss. Fear dried into fibers and rewetted by humidity until it became a smell that didn't leave. The air here moved more than the leak chamber, but it moved like it was being pulled through bodies—through lungs that had already given up on clean breaths.
The ceiling stayed low.
Helmet scraped once and left a wet lime smear.
The scrape echoed in a way that made the tunnel feel smaller than it was.
Small could feel like shelter.
Shelter was poison.
Inhale—two shallow steps.
Exhale—two.
The count held only because Mark forced it. Posture stole volume. Wet air made each inhale feel heavier. The cracked rib complained every time the stiff board pressed into it under the belt wrap. The courier tube jammed into the belt wrap pressed too, a hard cylinder that turned every twist into a bruise that reached bone.
The left shoulder bled and failed. The joint slipped and refused alignment, turning the arm into weight rather than tool. The forearm burn under bandage pulsed whenever the shoulder shifted, as if the skin wanted to keep talking.
The right hand cramped on the falchion handle. The thicker grip and leather wrap helped, but the dominant hand still tried to open itself by fractions. Mark didn't fight the spasm with finger strength. Finger strength wasn't reliable.
He pressed the handle into forearm and bracer, using bone and wrist angle as a clamp.
Ugly.
Necessary.
Latch stumbled behind him, dragged more than walking. The injured knee wrap was dark and wet. The ankle chain scraped. The wet breathing was loud in the low tunnel, and loud was a lifeline now: noise meant the world wasn't pretending to be safe.
The collar chain stayed wrapped once around Mark's left wrist. Fingers weren't reliable. The chain bit raw skin where blisters had torn. Wet sting spread.
He didn't stop.
Stopping was execution by air and engine together.
The tunnel widened into a low gallery.
Not a balcony like above.
A crawl-height overlook cut into stone, with iron bars bolted along its edge. Past the bars, the space dropped into a larger chamber lit faintly by stale lamplight—sconces caged behind iron mesh, their flames small and grudging in the damp.
Below, people moved.
Not guards.
Not hook-men.
Bare feet on wet stone. Shackles clinking. A chorus of coughs and low curses. Bodies in rag cloth, skin shiny with sweat and grime, shoulders hunched because the air stole breath.
Convicts.
Labor stock.
Not prisoners kept in quiet cells.
Bodies kept near the Underworks because the Underworks needed hands.
Their chains made sound that didn't stop.
That mattered.
Mark's sternum loosened by a fraction because danger was present in a way the engine could read. Not managed calm. Not the silence of a safe room trap.
Living noise.
The drain eased by degree.
He didn't relax.
Relief was poison.
A voice below snapped, hoarse.
"Up there—!"
Another voice answered, laughing too hard.
"Not guards."
A third voice—angry, hungry—rose.
"Blade."
They were looking up.
The helmet and bracers made Mark less like a corpse and more like a target. The falchion's dull shine caught a trace of lamplight.
The convicts didn't move like a squad. They moved like water.
A cluster shifted toward the stairs that led up to the gallery.
Mark didn't back away from them.
Backing away widened space behind, and space could become quiet in the wrong way if the pursuers behind chose to hold.
Quiet had become deadlier.
He needed movement around him.
He needed bodies in motion.
Bodies in motion meant threat.
Threat kept breath open.
The stairs down were narrow and wet. The steps weren't carved for comfort. They were carved for carts, shallow and slick, with filth packed into grooves.
Mark didn't descend fast.
Fast meant slip.
Slip meant fall.
Fall meant stillness.
Stillness meant drain.
He took the steps flat, center low, hook tool tapping ahead for traction.
Tap.
Tap.
The hook tip found grit, then slime, then grit again. He adjusted foot angle by inches each time, not lifting the compromised leg high, sliding it low.
Latch couldn't manage steps.
The injured knee shook and wanted to fold. Mark towed him with the collar chain hooked through the hook tool, letting the right forearm and bracer do the pull so the bleeding left shoulder didn't take full load.
Latch scraped down the stairs, ugly, but moving.
Moving was all that mattered.
At the bottom, the convicts were close enough to smell.
Their breath was wet and sour. Their eyes were bright in the wrong way—too awake, too hungry for anything that moved.
They weren't all threats.
But in a swarm, individual intent didn't matter.
The swarm mattered.
A man with a broken cup in his fist lunged first, not because he had a plan, because he was closer than the others and wanted to be the first to take something.
Mark didn't meet him with a duel cut.
He met him with displacement.
He slammed the falchion's flat into the man's collarbone line—compact, weight-driven—breaking the lunge without burying the edge.
The man folded and went down.
The swarm surged.
Not toward the downed man.
Past him, toward Mark and Latch and the idea of escape.
They weren't coordinated enough to be a unit.
They were coordinated enough to be a hazard.
Mark felt the engine twitch toward drain panic anyway because the chamber's low ceiling and damp air still read as shelter to the curse, even while bodies were near. Shelter was a lie, but the engine didn't know disgust.
It knew "enclosed."
It knew "not open."
He forced danger into sensation by making a harsh note.
He slammed the falchion's flat against the iron bars beside the stairs.
Clang.
The sound was loud in the chamber.
It traveled.
It would pull more people.
More people meant more motion.
Motion meant threat-state.
Threat-state was life now.
The convicts flinched at the clang and then surged harder, as if the sound meant something had changed and they didn't want to be left behind.
A man grabbed Latch's ankle chain.
Not a professional clamp. A desperate grip.
Anchor the weak one.
Latch's injured knee buckled, and the boy made a wet choking sound as he was jerked sideways.
Mark did not pause to evaluate.
Pause was stillness.
He chopped the grabbing hand.
A compact downward cut.
The falchion's weight did the work even through a cramping grip.
Fingers severed.
Blood spilled onto wet stone.
Heat slammed through Mark.
Refill.
Breath opened.
Tremor vanished.
The cracked rib stayed cracked. The left shoulder stayed failing and bleeding. The dominant hand still cramped.
But alignment returned long enough to turn the swarm into a tool instead of a trap.
He didn't try to kill the whole crowd.
He couldn't.
He didn't need to.
He needed a moving threat thread that followed him and also collided with his pursuers.
He needed to weaponize being chased.
He shoved into the swarm's edge and moved laterally, keeping Latch tight to his hip and the wall seam, using bracers and shoulder to push bodies aside without getting stuck.
The convicts pressed in.
They didn't know where he was going.
They only knew movement meant opportunity.
He gave them a direction.
He led them toward a corridor mouth where the air pulled slightly cooler—draft meant route—and where the floor changed from slime-packed stone to rougher grit.
Rougher grit meant better traction for him.
The swarm followed.
Behind them, the sound of boots entered the chamber.
Not convict feet.
Not bare scrapes.
Boots.
Careful placement.
A professional cadence.
The hook-men and gate sentries had tracked the noise and the route.
Their voices were clipped, calm, wrong in this human mess.
"Contain."
"Do not enter deep."
They didn't want to fight in a convict swarm.
Smart.
A swarm is an environment.
Environments don't duel.
Mark used their caution.
He did not attack them directly.
He drove the swarm into them.
He cut one rope tie holding a hanging chain curtain at the corridor mouth—maintenance junk, likely meant to slow carts—and let the curtain drop.
The curtain didn't stop convicts.
It slowed boots.
Boots hated clutter that wasn't part of their plan.
The convicts crashed through the chain curtain, clinking and shouting, and the boots behind were forced to widen and step around, losing clean formation.
Mark didn't stop to watch.
Watching was stillness.
Stillness killed.
He moved down the corridor mouth ahead of the swarm, keeping just enough distance that the convicts stayed behind him as noise, not in front of him as a wall.
That was the balance.
Not too far—too far meant quiet and drain.
Not too close—too close meant being trampled and stopped.
He maintained it with sound.
A ring ticked under a boot.
A chain clinked.
A falchion rasped once against stone.
The corridor became a flood channel of bodies.
Convicts first.
Then boots behind.
Then the Underworks itself—water trickle, rats skittering, vents breathing weakly.
Everything moving.
Everything dangerous.
The drain stayed at bay by degree because danger was constant.
Breath stayed open by the engine's cruelty because threat never left.
Breath still cost because the ceiling stayed low and the air stayed wet.
Both meters mattered now.
Mark learned the new operational truth without saying it aloud:
If he couldn't find danger, he would have to make it.
If he couldn't make it with traps, he would make it with people.
People-as-threat.
People-as-fuel.
He didn't need the fortress's system reveal yet to live it.
He was already doing it.
The corridor ahead narrowed into a choke where a low grate sat half open, a maintenance lip that could be lifted into another run. The grate was slick. The floor beside it dropped into a shallow water channel.
Mark didn't want to go through the grate yet.
Grates were quiet pockets if no one followed.
But he might need it if the swarm turned.
And swarms always turned.
A convict at the front tripped on the grate lip and fell into the shallow channel, splashing black water. The splash drew laughter and curses.
The laughter changed tone.
It stopped being "we're escaping."
It became "we have prey."
Eyes shifted toward Mark and Latch again.
The swarm's hunger began to reorient.
Not toward the boots behind.
Toward the nearest bleeding things.
Mark's left shoulder bled.
Latch's knee bled.
Blood smell sharpened in wet air.
Mark felt the swarm beginning to turn, subtle but real—bodies angling inward, hands reaching, voices sharpening.
He couldn't let them fully pivot onto him.
If the swarm became his enemy instead of his moving threat buffer, he would be stopped.
Stopped meant stillness.
Stillness meant drain.
He needed to keep them pointed backward.
He needed to keep them angry at the boots.
He made a choice fast, because choice windows were shrinking.
He grabbed the nearest convict—one already stumbling—by cloth collar with his bracered forearm and shoved him backward into the oncoming boot line.
Not a kill.
A throw.
The convict collided with a guard's chest.
The guard stumbled.
A second convict slammed into the guard.
Then a third.
The boot line's calm broke into shouts.
"Back—!"
"Do not—!"
Convicts didn't obey.
They surged.
They grabbed.
They bit.
They drowned calm in bodies.
Mark used the sudden collision chaos to pull Latch forward toward the half-open grate, positioning to slip through if the swarm completed its turn.
The grate was narrow.
The ceiling beyond looked lower.
Breath would be worse.
But breath could be managed if threat stayed close.
If the swarm followed.
And that was the problem: if the swarm didn't follow, the grate would become a quiet pocket and the drain would steepen.
Mark couldn't predict which.
He could only commit.
The convict swarm behind him roared, half at the boots, half at the smell of blood.
Their direction was splitting.
Their hunger was splitting.
And Mark felt the moment teeter: either he would weaponize them successfully and keep them as a moving threat thread—
or the swarm would turn fully, become a wall of hands and teeth, and stop him in a low wet choke where air and drain would finish him together.