Two Days Later
Qin Mo had not slept properly in forty-eight hours.
That did not mean he was tired in the way ordinary men understood the word. His body could endure strain that would have killed a baseline human several times over. His mind, however, still needed rhythm, still preferred sequence, still found irritation in interruption and satisfaction in completion.
So he worked.
The underground fabrication chamber beneath the 47th Regiment's fortress had become a shrine to practical blasphemy. Not a Mechanicus shrine of incense, red robes, oil, and binharic chanting, but a place of hot metal, clean force-fields, humming gravitic presses, half-assembled drones, stacked power cores, and soldiers too frightened to call anything they saw by the correct heretical name.
At the center of it all, Qin Mo stood before a cluttered workbench and assembled the sixth suit of power armor.
His hands hovered above the frame rather than touching it. Armor plates lifted from nearby racks and drifted into position, guided by invisible gravitic fields so fine they aligned components down to tolerances no local forge could have reproduced. Servo-bundles slid into joint housings. Actuator cables threaded themselves through protective channels. Ceramic insulation sealed around power conduits. The armor's core woke with a deep, contained thrum, less like an engine starting and more like a beast drawing its first breath inside a cage.
Beside him, a spoon rose from an opened ration pack and traveled steadily to his mouth. Qin Mo accepted the mouthful without looking away from his work. He chewed, paused, and frowned.
For two days, he had avoided the new synthetic ration paste because he had assumed anything produced by battlefield recycling drones from Underhive biomass would taste like industrial punishment.
He had been wrong.
It was surprisingly good.
Not "home-cooked meal" good. Not even "cheap convenience-store food at three in the morning" good. But by Imperial standards, it bordered on decadent. It had texture. It had seasoning. It did not cling to the mouth like powdered corpse-starch mixed with regret. Most importantly, it did not make him want to file a complaint with whatever forgotten bureaucrat had first decided that human nutrition should be treated as a disciplinary measure.
As he ate, he understood exactly how it had been produced.
The logistics drones collected battlefield organic matter with ruthless efficiency: fallen cultists, mutated remains, edible fungal growths, nutrient-rich sump algae, livestock substitutes from abandoned hab-farms, and other biological refuse that would otherwise rot in the dark or feed something worse. The material was sterilized, chemically broken down, filtered, purified, and rebuilt into stable nutritional blocks and paste. Contaminants were burned away. Genetic corruption was screened out. Toxins were isolated and destroyed.
The first batches had been tasteless. Safe, nutritious, and completely joyless.
Then the drones had learned from troop reactions.
Not independently. Not creatively. Qin Mo had not designed them to become culinary philosophers. But within their permitted parameters, they had analyzed consumption rates, morale reports, leftover quantities, and informal soldier feedback. Safe flavor compounds were introduced. Texture was adjusted. Salt levels were corrected. A faint savory note was added to disguise the origin of the base material from men who were better off not thinking too hard about it.
The result was ugly, gray, and excellent for keeping soldiers alive.
....
A calm mechanical voice filled Qin Mo's comms.
["Based on collected data from three logistics units, the current ration formulation maintains a 100% approval rating among active troops who have consumed at least one full serving."]
A pause followed. Qin Mo suspected the AI Core had learned that pauses made reports easier for humans to process.
["Over 70% of reporting personnel describe increased physical strength, improved alertness, and accelerated wound recovery following sustained consumption. Medicae observations support a measurable improvement in tissue repair and resistance to fatigue. Findings have been uploaded to the data core for continued optimization of the supply chain."]
It was a routine report.
The AI Core functioned autonomously within the strict limits Qin Mo had imposed, but he still monitored its actions. He trusted his design. He did not trust any system enough to ignore it entirely. That was how fools ended up murdered by their own cleverness.
He swallowed another bite and adjusted the alignment of a shoulder actuator with a flick of two fingers.
"What about the intelligence network?"
["All completed reconnaissance drones have been deployed."]
A tactical data stream unfolded across the corner of his visorless vision, projected directly through the chamber's hololithic emitters. Lines of blue-white light formed a layered map of the Underhive: transit corridors, collapsed maglev routes, hab-caverns, old manufactorum arteries, sump channels, enemy-held sectors, and pockets of Imperial resistance still burning in the dark.
["We have confirmed the existence of 42 remaining defensive positions."]
Markers appeared. Some steady. Some flickering. Some surrounded by red threat indicators.
["18 are under heavy attack."]
More data populated the display. Ammunition estimates. Casualty projections. Enemy density. Structural integrity. Communications strength. Drone confidence ratings.
["3 are on the verge of collapse."]
Qin Mo's hand stopped above the armor frame.
["Including the defenders currently sheltered at this fortress, total surviving Imperial personnel within the Underhive number 357,231."]
For the first time in hours, Qin Mo fully stopped working.
"Say that again."
["Total surviving Imperial personnel within the Underhive number 357,231."]
Three hundred and fifty-seven thousand.
That number was wrong. It had to be wrong.
According to Klein's earlier reports, before the offensive collapsed, the Lord Marshal had diverted only fifty thousand troops into the defensive chain. Even allowing for scattered remnants, attached labor units, wounded stragglers, and half-destroyed companies that had crawled into any position still flying an Aquila, the number should not have grown by more than a few tens of thousands.
So where had the extra three hundred thousand people come from?
["There is a civilian settlement within the Underhive, designated Kato."]
The AI answered before he asked the question aloud.
Qin Mo stared at the map as a new marker brightened far to the west. The settlement's outline was not a neat fortress sigil or military grid. It sprawled across multiple buried districts, service caverns, old market zones, manufactorum basements, gang territories, and residential warrens. A city beneath a city, alive where every sane planner would have expected only ruins and monsters.
He slowly nodded.
"That explains it."
A civilian population. Underhive families. Scavenger clans. Labor gangs. Criminal workshops. Refugee blocks. Militia groups. People who had survived in the deepest layers of the hive long before the PDF learned the word "insurgency" could apply to something with tanks and artillery.
Qin Mo lifted his helmet from the bench and placed it over his head. The seals locked with a sharp, pressurized hiss. His face vanished behind armored plating and cold visor-light. Internal systems woke around him in layered blue.
"Calculate the best reinforcement plan."
The chamber dimmed as his HUD took priority. A detailed three-dimensional topographic map filled his field of vision, rendered in shifting gray, blue, and threat-red. Defensive positions pulsed across the Underhive like wounded organs.
Green: stable, for now.
Orange: under siege but holding.
Red: critically endangered, low manpower, collapse imminent.
A route formed through the map, not a simple line but a chain of viable movement corridors, broken vertical shafts, drone-supported transit points, and enemy-patrolled kill zones. It bent around collapsed industrial sectors, avoided flooded sump channels, and threaded through districts where hostile concentrations were light enough for rapid passage.
["Two of the three high-risk positions can be stabilized using fire support drones."]
The map highlighted two red markers, then overlaid projected drone flight paths.
["However, the settlement of Kato, located approximately 1,000 kilometers west of this fortress, requires your direct intervention."]
A second pause.
["I request authorization to deploy fire support drones."]
"Granted."
The word had barely left Qin Mo's mouth before the fortress above reacted. Hidden launch shutters opened along reinforced exterior bays. Four fire support drones lifted from their cradles, anti-grav engines roaring low enough to vibrate through the fortress walls. Their armored bodies rotated toward assigned targets, weapon pods locking down as targeting lenses burned through smoke and dust.
Then they accelerated into the Underhive gloom.
Qin Mo watched their projected paths for two seconds, confirmed no immediate faults, then turned back to the sixth suit of armor. It stood upright now, sealed, armed, and waiting.
"I should move out as well."
He looked at the armor for a moment longer than necessary.
It was good work. By any sane standard, it was extraordinary. A human-scale power suit with integrated gravitic shielding, enhanced servo strength, sealed life support, reinforced energy absorption, battlefield data-linking, jump capacity, and weapons compatibility beyond anything the local PDF should have possessed. It could make a soldier into a walking breach unit. It could turn a frightened man into the center of a counterattack.
And yet Qin Mo felt hollow.
This was not his masterpiece.
Over the past weeks, he had realized something about himself that should have worried him more than it did. He did not create technology only because survival demanded it. He loved creating.
He loved taking a problem apart until its bones were visible. He loved turning scrap into function, function into doctrine, and doctrine into victory. He loved the moment when a concept became a mechanism, when a mechanism became a weapon, and when that weapon saved men who should have died screaming in the dark.
But now?
He was too efficient.
What should have taken teams of engineers decades of sanctioned research, manufacturing trials, theological obstruction, and political sabotage, he completed in days with battlefield salvage and enough contempt for conventional limitations to qualify as a new branch of heresy.
The challenge was fading.
That bothered him.
Somewhere inside him, deeper than personality and sharper than memory, something hungered for the next design. The next impossibility. The next act of creation large enough to matter.
In that hunger, he understood something he did not enjoy admitting.
The power he wielded came from a Star God obsessed with creation.
That was not a comforting inheritance. It was useful, dangerous, and far too easy to mistake for destiny.
But Kato was dying, and introspection could wait.
Qin Mo opened a vox channel.
"Grey, fetch Grot. His armor is ready."
Grey's reply came through a wash of static and background machinery.
"Are we heading out?"
"Of course."
Qin Mo picked up his Aquila-topped staff. The golden wings caught the chamber light, turning the symbol into something halfway between a banner and a warning.
"We're moving to reinforce the settlement of Kato."
....
Kato: The Underhive Settlement
Kato was not a refugee camp.
It was not a barricaded hab-block, not a military outpost, not a temporary shelter built by desperate civilians waiting for proper Imperial authority to arrive.
Kato was a functioning micro-city carved into the festering heart of the Underhive.
It sprawled through old transit halls, collapsed commercial tiers, abandoned manufactorum basements, sewer caverns, market tunnels, forgotten shrines, gang fortresses, and residential warrens that had never appeared on any official map still maintained by the Administratum. Its ceiling was a broken canopy of pipes, support arches, hanging cables, cracked roadway slabs, and ventilation towers that breathed poison in slow mechanical coughs. Its streets were metal ramps, plank bridges, drainage channels, welded platforms, and alleys narrow enough for a knife fight but too narrow for a coffin.
Here, life had continued because life in the Imperium was stubborn, ugly, and difficult to extinguish completely.
Bounty hunters scavenged ancient relics from forgotten ruins and sold them to whoever had ammunition, medicine, or enough armed friends to make cheating them unwise. Gangs ran illicit manufacturing dens where stubbers, pipe rifles, chemical burners, counterfeit charge packs, and contraband machine parts were built under bad light by hands missing fingers. Civilians labored in shifts, trading repair work, fungus harvests, hauling, welding, laundering, corpse removal, and sentry duty for food and protection.
Water came from fungal reservoirs, condensation traps, stolen purification rigs, and pipes whose original owners had died generations ago. Food came from corpse-starch presses, mold farms, sump algae, vat insects, and whatever could be grown in sewer caverns without glowing too brightly in the dark.
Currency existed, but no one trusted it. Credits meant little when a tunnel collapsed, when a gang changed flags, or when the man selling ammunition decided your money looked too clean to be real. Labor mattered. Loyalty mattered. Firepower mattered most of all.
In Kato, survival was not a right.
It was a wage, a debt, a reputation, and sometimes a thing taken from someone weaker before they could take it from you.
Qin Mo had heard the name before in scattered reports.
He had assumed Kato was already lost.
When he arrived, he found 2,000 PDF soldiers holding the main highway into the settlement.
The "highway" was an old cargo artery wide enough for armored vehicles, flanked by hab-ruins and utility towers, its surface cracked by shell impacts and patched with scrap plating. Barricades blocked the central approach. Heavy stubbers sat in sandbag nests. Lasgun teams occupied windows blown open into firing positions. Wounded men were carried back through drainage tunnels while ammunition came forward on handcarts pushed by civilians with hard faces.
The PDF soldiers saw Qin Mo before he reached the command trench.
More accurately, they saw the Aquila staff.
"It's him!"
The shout spread faster than any official order. Heads turned. Men who had been hunched behind barricades straightened. A wounded trooper tried to rise until a medic shoved him back down. Someone began making the sign of the Aquila with shaking hands. Others simply stared.
Morale surged, fragile but immediate, like a dying engine catching again after one hard strike.
"Hold the line," Qin Mo ordered.
He did not shout. He did not need to. His armor carried the command across the barricade through external speakers, and men obeyed because his arrival already felt like an answer to prayers they had been too exhausted to finish.
Qin Mo turned to the nearest trench officer, a narrow-faced lieutenant with a cracked helmet, blood on one sleeve, and the haunted eyes of a man who had spent the last six hours watching casualty numbers become personal.
"I was informed you have 2,000 troops," Qin Mo said. "But they're all concentrated here. Who's fighting in the rest of the city?"
The lieutenant opened his mouth to answer.
"VROOM—!"
An engine roared behind them, rough, abused, and aggressively unblessed by any machine cult ritual.
A utility truck rumbled forward from a side ramp, its tires wrapped in chains for traction, its engine coughing black smoke through a pipe welded where the exhaust should have been. Scavenged plate steel had been bolted across its sides. Crude devotional symbols to the Emperor had been painted over old gang markings. A tarp covered the truck bed, though the shape beneath it was too large and too angular to be cargo.
The vehicle stopped beside Qin Mo with a squeal of brakes.
The driver jumped out first. He was a civilian: broad-shouldered, stubble-jawed, wearing a patched work coat reinforced with ceramic tile, scrap metal, and what looked suspiciously like pieces of an old riot shield. His wife climbed down after him, lasrifle already slung across her chest. Three children followed, each wearing makeshift armor built from duct tape, broken flak panels, plastek plates, and whatever household items had been strong enough to survive being hammered flat.
Qin Mo's visor-light narrowed slightly.
"This is a warzone. What are you doing here?"
The man snorted and threw a sideways glance at the entrenched PDF troops with open disdain.
"Helping these useless bastards."
The lieutenant closed his eyes for half a second, the expression of a man who had heard this before and lacked the ammunition to argue with it.
The civilian climbed onto the truck bed, boots thudding against corroded metal, and tore away the tarp.
Beneath it sat a quad-barreled heavy stubber mounted on a reinforced swivel frame. The weapon was ugly, over-oiled, and wrapped in cooling coils clearly scavenged from at least three different machines. Its ammunition belts lay coiled in steel boxes like sleeping serpents.
His family moved before anyone gave an order.
His wife kicked open a side compartment and hauled out two fresh ammunition belts. The eldest son checked the feed tray. The middle child braced the rear stabilizer strut with a practiced motion. The smallest, a girl barely taller than the lasrifle she carried, climbed onto a crate and began scanning rooftops through a cracked optic.
Within seconds, the man locked his stance behind the gun.
"Clear the front!"
The PDF soldiers closest to the firing lane ducked without complaint.
The heavy stubber opened up.
Thunder hammered the highway. The weapon's recoil shook the truck so hard the suspension screamed. Brass casings poured from the ejection chute and bounced across ferrocrete. Tracer fire tore into the shadows beyond the barricades, shredding figures trying to cross between burned-out haulers.
His family was not idle.
The wife and eldest son took positions beside the truck with lasrifles, firing in short, efficient bursts. The middle child fed fresh belts and cleared a jam with hands too small for the weapon but too practiced to hesitate. The youngest girl squeezed her trigger three times. Three distant shapes dropped from a rooftop firing slit.
Qin Mo stared for a moment.
Then he looked back at the lieutenant.
The officer sighed.
"As you can see, my lord… most of the fighting inside the city is handled by the civilians."
He gestured toward Kato's skyline.
Rooftop nests lined with sandbags and scrap-iron shields overlooked the streets. Chimneys belched smoke from jury-rigged workshops. Banners sewn from shredded flak jackets and work-cloth snapped in the toxic wind. Civilians ran ammunition up ladders while old men with shotguns watched alley mouths. A woman in a welder's mask dragged a wounded PDF soldier behind cover, then took his lasgun and continued firing from the same position. Somewhere deeper in the settlement, a bell rang three times, and entire blocks shifted in response as if the city itself had muscles.
Qin Mo exhaled.
So this was why Kato had endured.
In the Underhive, those too weak to fight had already been culled by hunger, gangs, disease, predators, toxins, accidents, and the kind of neighbors who smiled while measuring the value of your boots. The people who remained were not soft civilians waiting for rescue. They were survivors who had turned domestic life into militia doctrine because the alternative was extinction.
"Truly," he muttered, "the Underhive breeds the toughest bastards in the Imperium."
The lieutenant gave him a tired look. "They also breed the most insubordinate bastards in the Imperium."
The civilian on the truck, still firing, shouted without turning around. "We heard that, uniform!"
"You were meant to," the lieutenant shouted back.
A shell detonated somewhere beyond the forward barricades. The blast lit the highway orange and threw dust over everyone in the trench. The civilian heavy stubber kept firing through the shockwave. The smallest child wiped grit from her optic with her sleeve and resumed searching for targets.
Qin Mo looked west, toward the deeper streets of Kato where the fighting still raged. His HUD filled with hostile markers, civilian defense clusters, PDF positions, heat blooms, ammunition shortages, and routes that changed by the second as barricades fell or were reinforced.
This would not be a clean rescue.
This would be urban war inside a city that did not know how to surrender.
Qin Mo tightened his grip around the Aquila staff. Behind him, Grey and Grot moved into position, their new armor humming as weapon systems woke. Above them, the first fire support drone broke through the smoke ceiling, its targeting lenses glowing like red stars.
The PDF saw it. The civilians saw it. The enemy, hidden in Kato's streets, saw it too.
For one heartbeat, the whole highway seemed to hold its breath.
Then Qin Mo stepped over the barricade and advanced.
And then, he joined the battle.