Chapter 50: The Undercity Purge

The entrance to the lower sewers beneath the industrial sector looked like the rotting mouth of a mechanical beast.

Rusted iron grates had been violently peeled back.

A thick, yellowish fog drifted out from the darkness.

The air smelled of sulfur, stagnant water, and the sharp tang of acidic decay.

I stood at the edge of the descent. My hand rested on the hilt of my newly forged steel longsword.

Beside me, Kaelith adjusted the leather straps of her twin daggers.

Her eyes were already adjusting to the gloom.

Rolf stood on my other side, resting his massive, double-bladed battleaxe on his broad shoulder.

"So, how was the date?" Kaelith asked without looking away from the dark tunnel.

Rolf grinned, baring his canine teeth.

"Fantastic. The receptionist knows all the best underground taverns. She even pays for her own ale. I think I am in love."

"Focus, you two," I said, though I could not help but smirk.

"We are walking into a confined space with limited visibility. The Prime Minister called these things Slag-Crawlers. From the residual tracks I am seeing on the grating, they are heavy. Likely a mix of insectoid biology and metallic shell plating."

"What is the strategy, boss?" Rolf asked, his demeanor shifting instantly into professional muscle.

"Standard heavy-armor takedown," I explained.

"Their carapace will be too thick to cut through directly. We do not waste energy hacking at their backs. We aim for the joints, the underbelly, and the sensory organs. Kaelith, you take the flanks and blind them. Rolf, you draw their aggro and break their footing. I will move in for the execution."

"Understood," Kaelith whispered, her form already beginning to blur into the shadows.

I engaged the pneumatic valves in my Vanguard Arm. The brass plates hissed softly, building up a steady baseline of kinetic pressure.

"Let us go clean up the city."

We descended into the dark.

The deeper we went, the louder the ambient noise of the Forge became.

Above us, massive pistons thumped and gears ground together, sending vibrations down the brick walls.

But beneath that industrial heartbeat, there was a secondary sound.

It was a wet, rhythmic clicking.

My visual interface flickered to life as a pair of glowing, sickly green eyes pierced the yellow fog ahead of us.

{

[Target Scanned: Slag-Crawler]

>Level: 11

>Class: Mutated Scavenger

>Threat: High Armor. Corrosive Saliva.

}

Before the system prompt even faded, the creature lunged.

It was the size of a carriage.

It was built like a grotesque fusion of a centipede and a snapping turtle.

Its back was covered in thick, hardened slag and scrap metal that had fused directly to its exoskeleton.

"Scatter!" I ordered.

Rolf roared and stepped forward.

He swung his battleaxe in a massive upward arc, catching the Slag-Crawler squarely on its reinforced jaw.

The impact rang out like a blacksmith’s hammer striking an anvil. The beast was thrown off balance.

Its front legs scrambling against the slick stone floor.

Kaelith materialized directly above it.

She dropped from the arched ceiling, driving both of her daggers deep into the soft, unarmored gaps behind the creature’s neck plates.

Dark, acidic blood sprayed outward.

The Slag-Crawler shrieked and thrashed violently.

It whipped its heavy tail, forcing Kaelith to disengage and shadow-step away to avoid being crushed.

The beast snapped its jaws, preparing to spit a glob of corrosive acid at Rolf.

It didn’t even get the chance.

I activated the [Shadow-Weave Sword Technique].

The system knowledge flooded my muscles and altered my center of gravity.

I moved with a fluid, unnatural grace that completely bypassed the heavy weight of my mechanical arm.

I slipped right under the monster’s line of sight, gliding across the wet stone like a ghost.

I swept my steel longsword upward, severing the tendons in its front left leg.

The Slag-Crawler collapsed onto its side with a heavy crash, exposing its pale underbelly.

I did not use my sword for the finishing blow.

I stepped directly into its guard, pulled back my Vanguard Arm, and released all my pent-up steam pressure.

My brass fist struck the creature’s chest plate with the force of a cannonball.

The kinetic charge shattered the exoskeleton instantly.

The beast twitched once and went completely still.

{

[Combat Concluded]

>Experience Gained: +450 XP

}

"One down," Rolf grunted as he shaked the acidic blood off his axe.

"Not quite," Kaelith warned from the shadows. "Listen."

The clicking sound was multiplying. From the fog ahead, three more Slag-Crawlers emerged.

Their mandibles snapped hungrily as they smelled the fresh blood of their kin.

"Hold the line," I commanded.

The next ten minutes were a blur of coordinated violence.

The [Shadow-Weave Sword Technique] was the perfect complement to my build.

The footwork allowed me to evade their acid spits with millimeter precision, setting me up for devastating counterattacks.

Whenever Kaelith opened a wound with her daggers, I was there a fraction of a second later.

Driving my blade into the exposed flesh. Rolf was our unbreakable shield, who absorbed their heavy charges.

He tossed those massive insects aside through sheer brute strength.

I ducked under a snapping claw. Channeled my mana into a [Sovereign’s Conduit] aura, and drove my sword straight through the final creature’s glowing green eye.

It pierced all the way to the brain.

{

[Combat Concluded]

>Experience Gained: +1350 XP

[Level Up!]

>Current Level: 11

>Attribute Points Available: +5

}

I exhaled deeply.

Letting the rush of new system energy wash over my tired muscles.

I allocated three points into Strength and two into Agility.

I felt my reaction time sharpen immediately.

"Good work," I said.

As I wiped my blade clean with a rag from my belt.

"The Prime Minister was right. This is a massive infestation."

Rolf kicked one of the carcasses over with his heavy boot.

"Ugly bastards. The toxic runoff really messed them up."

"That is what we were told to believe," Kaelith said quietly.

She was kneeling beside the largest of the dead Slag-Crawlers, her eyes narrowing in the dim light of our mana-lantern.

"Boss, you need to look at this."

I walked over and crouched beside her.

She pointed the tip of her dagger at the thickest part of the creature’s back plating.

Hidden beneath a thick layer of corrosive grime and sewer muck were deep, jagged lines.

I used the edge of my brass arm to scrape the sludge away.

As the metal cleared, a faint, pulsing purple light bled from the grooves.

They were not natural markings.

They were geometric, calculated, and deeply arcane runes.

This was not something that occurred through natural evolution.

This was artificial.

I had read many Fantasy Novels.

I know what this means.

’This is the work of a Evil Secret Organization!’

My System interface flared to life automatically, locking onto the strange magic.

{

[Target Scanned: Slag-Crawler (Modified)]

>Status: Artificially Engorged.

>Warning: Entity has been subjected to forced Blood-Magic binding. The runes act as an obedience brand and an aggressive mutation catalyst.

}

"These are not wild animals," I said, my voice turning ice cold.

The reality of the situation clicked into place.

"Someone carved these runes into their shells while they were still young. They are being intentionally bred."

Rolf gripped his battleaxe tighter, looking around the dark tunnel.

"Bred for what? Eating garbage?"

"No," Kaelith whispered.

She stood up slowly, looking further down the cavernous sewer tunnel.

"They are bred to guard something. Look."

I followed her gaze.

Faint, flickering torchlight painted the damp brick walls ahead. More importantly,

I could hear a sound cutting through the rhythmic dripping of the sewer water.

It was a low, resonant chanting.

It sounded like dozens of voices speaking in perfect, eerie unison.

We left the carcasses behind and moved forward in absolute silence.

I deactivated the steam valves in my arm to eliminate the hissing noise.

As the tunnel opened up into a massive, hollowed-out cistern, the true horror of the lower levels revealed itself.

The underground chamber had been converted into a profane temple.

Mounds of rusted gears, cracked pipes, and human bones were piled together to form a massive, grotesque idol.

It looked like a deity of gluttony, which was fashioned with multiple iron mouths and jagged metal teeth.

Dozens of figures wearing heavy, soot-stained robes knelt in concentric circles around a central pit in the floor.

Inside the pit, a swarm of juvenile Slag-Crawlers clicked their mandibles in a starving frenzy.

The walls of the pit were slick with fresh blood.

"The smog demands breath," a high priest chanted.

He stood on a raised platform of scrap iron, holding a staff tipped with a jagged purple crystal.

It was the exact same color as the runes carved into the beasts.

"The Ashen Maw requires life to cleanse the metal! We offer the flesh of the weak to forge the ultimate predators!"

Two heavily armored cultists dragged a screaming, terrified man toward the edge of the pit.

He was dressed in the grease-stained overalls of a lower-district factory worker.

Heavy iron chains bound his wrists, rattling loudly against the stone as he desperately dug his heels in.

"Please!" the worker sobbed, his voice echoing in the massive chamber.

"I have a family! Take my wages, take anything!"

The high priest did not even blink.

"Your family will breathe the holy ashes. Cast him in."

"This is not a pollution problem," I whispered to my squad, my grip tightening around the hilt of my sword.

The pieces of the political puzzle were falling into place.

This Cult of the Ashen Maw was breeding an army directly beneath the city.

Kaelith drew her daggers, her eyes locked on the high priest.

"Do we save him, boss?"

"We save him," I replied, the kinetic pressure in my arm building to maximum capacity.

"And we leave no survivors to report to their master."