«The Lord Commander's counteroffensive has been ongoing for over half a month.»
«During these past weeks, our advance has been relentless. The tide of war has turned decisively in our favor. Yet the heretics have not collapsed completely. They have begun to entrench themselves, fortifying their positions with the desperation of cornered beasts and the growing discipline of an enemy that has finally learned fear.»
The 87th Regiment had secured another hive sub-city by dusk.
Duncan Varr sat half-submerged inside the command cupola of his battle-scarred Leman Russ, the tank's hull caked in mud, ash, and the gray dust of pulverized ferrocrete.
The engine idled beneath him with a low, constant growl that vibrated through the seat, the decking, and the soles of his boots. Beyond the armor, the battlefield still breathed violence: scattered bolter fire cracked in the distance, artillery thumped somewhere beyond the hab-spires, and the occasional scream of collapsing metal echoed through the ruined avenues.
He wrote in his field journal by the dim light of his tank's internal lumen. His handwriting remained precise despite the movement of the engine and the faint tremor of exhaustion in his fingers. It was an old habit, one drilled into him long before Qin Mo's war had transformed the underhive. Officers recorded what happened. Survivors recorded what mattered. Duncan, increasingly, tried to do both.
For more than two weeks, the enemy had been in disarray.
Some cult cells had broken outright, fleeing through service tunnels like vermin driven from a burning nest. Others had collapsed into panicked mobs, firing on shadows, abandoning weapons, or screaming prayers to masters who did not answer quickly enough.
The worst of them, the most fanatical, had thrown themselves at Imperial lines with explosive harnesses strapped to their chests, turning their own bodies into crude martyrdom charges.
Then their behavior had changed.
Not all at once. Not clearly enough for a careless commander to notice.
At first, it had been a matter of spacing. Ambushers withdrew before drones could box them in. Suicide bombers began moving behind cover instead of charging straight down fire lanes.
Retreats became less like routs and more like deliberate withdrawals toward prepared kill zones. Their attacks still lacked the clean coordination of a professional army, but their local tactics had become sharper. More patient. More dangerous.
They were learning.
Unfortunately for them, learning was not enough. Not against what Qin Mo had built.
The newly subdued hive sub-city was proof of that. Autonomous artillery batteries had saturated the target sectors long before Duncan's regiment entered the area.
Combat drones swept the ruins afterward, crawling through shattered manufactoria, collapsed hab-blocks, transit tunnels, and sump-choked alleys to identify survivors. Hostile signatures were marked, pinned, and eliminated before most of the infantry had even dismounted.
By the time the 87th advanced, their task was brutally simple. Move through the ruins. Confirm control. Execute whatever remained.
It had not been a battle.
It had been a purge.
Duncan closed the journal with careful finality.
The battered leather cover bore a single name.
Albert.
For a moment, the roar of the tank faded beneath the older weight in his chest. Albert Halser had been dead for weeks now, but grief did not obey campaign schedules. It returned in small, sharp moments: in the empty seat at a command table, in a joke no one finished, in the sight of a tank's engine deck where Albert would once have stood with a cup of burnt recaf and a complaint about maintenance crews.
Duncan rested one gloved hand on the journal.
For the first time since Qin Mo's personal visit, guilt stirred in him again. When the Lord Commander had asked about the needs of his troops, Duncan had not mentioned Albert's final wish. He had buried it beneath necessity, beneath logistics, beneath the iron arithmetic of the campaign.
He still believed he had made the right decision.
The war was not over. Men were dying every hour. Supplies, armor, fire support, reinforcements, evacuation, command links—those were the things a commander demanded first. The dead could wait. The living could not.
Even so, Duncan bowed his head slightly and murmured into the dim interior of the tank, low enough that no one over the vox would hear.
"But I know we're going to win. Everyone believes it now. And when we do, Albert, I'll see your wish fulfilled myself."
He placed the journal inside a reinforced personal reliquary built into the tank's command compartment. It was a standard-issue vault for officers expected to die violently: adamantine-laced ceramite casing, shock locks, heat baffles, and a purity seal pressed over the latch by a regimental priest who had later been killed by mortar fire.
It was meant to preserve orders, final letters, campaign records, and the last words of loyal servants of the Emperor when flesh failed and armor burned.
Duncan sealed it shut.
A sudden pounding on the outer hull tore him from his thoughts.
"Commander! You need to see this!"
Duncan rose through the turret hatch with practiced speed. Cold, filthy air slapped against his face. Ash drifted through the ruined street in slow gray sheets, catching in the tank's antennae and the edges of his greatcoat. Below, a company officer stood beside the Leman Russ, helmet tucked under one arm, his face pale beneath streaks of soot.
"What is it?" Duncan asked.
The officer held up a broken section of Praetorian power armor. It was a chest plate, or what remained of one. The ceramite had been gouged open, the inner lining blackened, and dried blood clung to the torn edges. A cracked data-port still blinked weakly beneath the right clavicle seal.
"Recovered from a bunker entrance two streets east," the officer said. "The suit's wearer is dead. But the recorder survived."
Duncan's expression hardened. He took the plate, braced it against the tank's hull, and connected a data-line from his command gauntlet into the damaged interface port. The armor resisted for a moment, machine-logic stuttering through corrupted memory. Then a combat recording flickered to life across his helmet display.
....
[Playback: Recovered Autosense Footage]
[Timestamp corrupted.]
"Looks like this was some gang bunker. Stay sharp."
"Yeah, yeah. I got it."
"Did your Bloodcrest lot have bunkers like this too?"
The footage came from a power-armored soldier's first-person perspective. A squad of PDF infantry advanced through a narrow underground shelter, its ceiling so low that the armored trooper's helm nearly brushed the pipework overhead. Moisture dripped from rusted valves. Steam hissed from ruptured conduits.
The walls were layered in grime, gang markings, old bullet scars, and fresh heretical graffiti scrawled in blood and industrial pigment.
One soldier stood out immediately. He wore flak armor instead of full Praetorian plate, and a bright red mohawk rose from his bare scalp like an act of deliberate defiance. His lasgun was held properly, but his helmet hung uselessly from his belt.
"Why the hell aren't you wearing a helmet?" someone asked.
"Because I want the Lord Commander to recognize my face when he looks across the battlefield."
A pause followed.
"That is the stupidest thing I've heard all week."
"But you have heard of me."
"Put your helmet on."
"After the sweep."
The squad moved deeper. Their banter continued, quieter now, strained by the kind of nervous humor soldiers used when a corridor felt wrong but no enemy had appeared yet.
They cleared one chamber after another. Storage rooms. Sleeping alcoves. A workshop littered with broken autoguns and empty ration tins. A shrine-space where the old gang symbols had been scraped away and replaced with crude devotional marks to the cult.
Then they reached the farthest chamber.
The lead trooper raised his weapon. Helmet lamps came on one by one.
Darkness peeled back.
At the far end of the bunker, hundreds of mutated figures were packed together in a twitching, breathing mass. They were not waiting in ambush. They were facing away from the squad, clawing, pushing, and pressing against a massive sealed plasteel door set into the rear wall. Some used tools. Others used bare hands. A few had battered their fingers bloody against the frame.
For one frozen second, the squad and the mutants existed in the same stunned silence.
Then the light touched them.
Heads turned. Too many eyes reflected white in the lamps.
"Back! Back! Move!"
Panic took the squad. Boots hammered against metal flooring as the soldiers sprinted for the exit. The camera swung wildly, catching flashes of tunnel walls, weapon muzzles, a stumbling trooper, the red mohawk turning as its owner shouted something lost beneath static. Behind them, the bunker filled with shrieks and the wet slap of mutated feet against the floor.
The recording lurched sideways.
A shadow crossed the frame.
The image cut to static.
Duncan's jaw tightened. Whatever had killed the recorder's wearer had done so instantly. The angle and final burst of sensor distortion suggested decapitation or catastrophic helm separation.
The officer beside the tank waited, tense and expectant. "Orders, sir?"
Duncan disconnected the data-line and handed the ruined chest plate back.
"Report this immediately. The Lord Commander's Thunderborns will handle it."
The officer stiffened. Surprise flickered across his face, followed quickly by disappointment.
"With respect, sir, this is an opportunity for glory. Seal the exits, deploy two companies and a pair of Leman Russ tanks, flush the mutants into the open, and we can wipe them out ourselves."
Duncan looked down at him for a long moment. The young officer had courage. That was not the problem. In the 87th, most men had courage now. Qin Mo's war had given them armor, weapons, victories, and the intoxicating belief that survival was no longer a miracle.
Courage, unmanaged, could get a regiment killed.
"I desire glory too," Duncan said. "But answer me carefully. Do you know how many mutants are down there?"
The officer hesitated.
"Do you know whether that sealed plasteel door is keeping something in or keeping them out?" Duncan continued. "Do you know why hundreds of mutated cultists were trying to breach it instead of manning the bunker defenses? Do you know whether the enemy wanted us to find this?"
The officer's expression changed as the implications settled.
Duncan's voice hardened. "We are not poking an unknown nest because you want a line in a victory report. We contain it. We inform command. We let specialists deal with it before one bunker becomes a district-wide disaster."
"Understood, sir."
"Good." Duncan climbed back down into the turret, then stopped halfway and looked back. "Tonight, every soldier in your company will transcribe the Praetorian power armor operations manual ten times."
The officer stared. "Sir?"
"And the section on bio-scanners will be memorized by dawn." Duncan's eyes narrowed. "Your missing patrol walked into a chamber full of non-human signatures because no one bothered to use the equipment the Lord Commander gave them. I will not lose men to ignorance dressed up as bravery."
The officer swallowed. "Yes, sir."
Duncan dropped back into the tank, leaving no room for argument.
....
Two minutes later, the gang bunker's exits were sealed.
Imperial infantry established a perimeter around the ruin, power-armored squads taking firing positions behind shattered hab-walls, overturned cargo haulers, and the armored bulk of two idling Leman Russ tanks. Drone-mounted searchlights swept over crumbling overpasses, collapsed market stalls, and the black mouths of service tunnels. Nothing moved without being tagged by auspex and challenged by half a dozen weapons.
Above them, a transport drone descended through the ash-dark air. Its anti-grav engines thrummed with contained pressure, making dust crawl in rippling circles across the ground. Soldiers straightened as it came in low. Some made the sign of the Aquila. Others simply watched, expressions shifting from fear to expectation.
To the rank and file, the Lord Commander's Thunderborns had become the Emperor's wrath made practical: warriors who arrived where lines were breaking, who carried weapons no forge-priest had blessed, who walked through fire and left heretics in pieces behind them.
Tonight, the warrior who stepped from the drone was Grot.
His armor was still wet with fresh blood. It streaked the plates across his arms, chest, and greaves, drying black where heat from the suit had cooked it against the surface. His gravitic hammer rested across one shoulder with casual familiarity, its head smeared in gore and fragments of something that had possessed too many bones.
He had clearly come straight from another fight. Whatever he had faced there, he had solved it in his preferred fashion: up close, loudly, and with enough force to make identification difficult.
The soldiers tensed when they saw him. Then they saw his face, and some of the fear eased.
Grot was not Grey. Grey carried silence like a drawn blade. Grot carried war like a tavern brawl that had grown large enough to require artillery. He laughed with common soldiers, remembered names when he could, traded insults with tank crews, and had once spent half an hour helping a wounded loader reassemble a jammed weapon feed while cursing the machine's ancestry in increasingly creative terms.
Tonight, though, his expression held amused disbelief.
"Seriously, brothers?" Grot boomed as he stepped off the ramp, hammer balanced over his shoulder. His voice carried across the perimeter without needing amplification. "Tanks, power armor, drones, and a full company at your backs, and you still called me for a bunch of mutants in a basement?"
The company officer saluted sharply. To his credit, he did not flinch. "It is not merely the mutants, sir. They were all gathered around one sealed chamber. They appeared to be trying to break through it."
Grot's grin faded by a fraction. Interest replaced mockery.
"Oh?" he said. "That is different."
At first, he had assumed this would be another routine purge. A nest of surviving mutants. A sealed gang den. Perhaps a few cultists too diseased or too stupid to retreat with the main force.
A horde of mutants attempting to breach a sealed plasteel door suggested something else entirely.
He rolled his shoulders, adjusting the hammer's weight. "Fine. We go together."
The officer blinked. "Together, sir?"
"Of course. You found it. You locked it down. You can have some credit when it dies." Grot's grin returned, broader this time. "Try not to get eaten before anyone writes that part down."
A few nearby soldiers laughed despite themselves. The officer's own expression brightened. Grot was a man of honor, at least by the standards of warriors who measured honor in shared danger and divided kills.
If Grey had been sent, he likely would have entered alone, killed everything inside, and emerged with a report consisting of three words and a corpse count. Grot, by contrast, let men stand beside him when he could afford it.
That mattered to soldiers hungry for proof that they were more than spectators in Qin Mo's war.
Grot strode toward the bunker entrance, scanning the broken descent with his suit's sensors. The opening yawned beneath a collapsed hab-foundation, half-hidden by rusted bracing and old gang barricades now splashed with fresh blood.
"By the way," he said over his shoulder, "I'm running my gravitic shield."
Every soldier within ten paces stopped moving.
Grot gave them a cheerful look. "So stand back unless you fancy being flattened into devotional paste."
The soldiers immediately stepped back.
Grot activated his bio-scanner. A layered tactical map unfolded across his HUD, building itself from auspex pulses, thermal bleed, chemical traces, and movement echoes within the underground complex. The system struggled for a moment against the bunker's thick plasteel and old interference shielding. Then the readings stabilized.
[231 non-human signatures detected.]
The contacts were densely packed near the rear of the bunker, clustered around the sealed chamber exactly as the recording had shown. Some shifted in place. Others scraped against the door. None appeared to be moving toward the surface yet.
Grot narrowed his eyes.
The sealed chamber itself showed nothing. No heat signature. No heartbeat. No respiration pattern. No ordinary biological trace.
Either nothing living was inside, or something inside was very good at hiding from sensors.
His humor drained away completely.
"What in the Emperor's name are you bastards scratching at?" he muttered.
He turned back toward the officer and the soldiers waiting behind him. When he spoke again, the easy swagger remained in his posture, but not in his voice.
"Listen carefully. If anything looks wrong, you run. Not withdraw with dignity. Not form a firing line. Run."
The officer nodded once, face pale but steady.
Grot lifted his hammer from his shoulder and brought it down into both hands. The weapon's field coils began to hum, low and hungry.
"I have a grav-shield," he said. "You do not."
The soldiers tightened their grips on their weapons. Behind them, searchlights swept the ruins. Ahead, in the stale dark beneath the hive sub-city, two hundred and thirty-one mutated things clawed at a sealed door that hid no life signs at all.
Grot stepped into the bunker first.
The others followed at a careful distance.