"You win."
Riley leaned back in the interrogation chair as if the words had cost her something physical. The chair was bolted to the floor, cold enough to bite through the thin fabric of her uniform, its rigid back pressing into her spine until every breath reminded her she had nowhere comfortable left to retreat.
She exhaled slowly. The breath fogged faintly in the recycled chill of the room before the vents pulled it apart.
She had lost.
Not in the dramatic way prisoners imagined, with chains, threats, and blood on the floor. She had lost by arithmetic. Qin Mo had more leverage, more knowledge, more power, and far less fear of consequences than anyone she had ever interrogated.
Resistance was pointless. She had nothing left to bargain with.
The chamber around them was a gray metal box buried inside the fortress, scrubbed clean of softness by necessity and Imperial habit. The walls were dull plasteel panels welded over old ferrocrete. A vox-grille hummed in one corner with faint static. Overhead, a single lumen strip flickered at uneven intervals, throwing thin, stuttering shadows across the table between them.
Across from her, Qin Mo grinned.
It was not a warm expression. It was the look of a man who had found the exact pressure point and intended to test how much force it required.
"As punishment," he said, folding his hands on the table with exaggerated solemnity, "I've decided to reassign you."
Riley's eyes narrowed.
"You'll be transferred to the next outpost," Qin Mo continued, his tone almost cheerful, "as a rifleman."
Riley shot upright so fast the chair scraped against its floor restraints. Alarm cut through her exhaustion.
"You can't punish me!"
The words came out sharper than she intended, more panic than authority. She forced herself to sit straighter, clinging to the last fragments of official confidence she possessed.
"You need me alive," she said. "You still need me to delete your criminal records."
Qin Mo made a small sound of amusement.
"You?"
The single word carried enough contempt to make her jaw tighten.
He reached across the table and picked up her data-slate. Its cracked surface lit under his touch, displaying Arbites authentication marks, encrypted access routes, and security warnings that had once made Riley feel insulated from ordinary men. Qin Mo glanced at them for less than a second.
Then he linked the slate to his helmet's neural interface.
"Access Tyrone Hive's Adeptus Arbites criminal database," he said. "Find my file. Make one hundred copies of my records. Then delete them one hundred different ways."
Riley went pale.
[Acknowledged. Accessing database.]
The AI's reply came immediately, calm and infuriatingly obedient.
[Duplicating records now—]
"Wait, I was joking! Don't actually copy them! If this backfires, it'll be a disaster!"
[Records deleted.]
Qin Mo paused. He manually searched his own name through the slate's interface. The display returned empty. He tried again with prisoner identifiers, arrest records, penal labor transfers, suppression-collar assignment logs, and associated incident reports.
Nothing.
No Qin Mo. No Prisoner No. 444. No trace of the man who had been dragged into the Underhive as condemned expendable labor.
His entire criminal record had vanished as cleanly as if a senior magistrate had signed the purge order personally and then shot every clerk who had seen it.
"…That was easier than I expected," Qin Mo muttered. He leaned closer to the display, suspicion replacing amusement.
"Does the Arbites never upgrade their firewalls? I was planning to design an offline infiltration virus, maybe spoof a maintenance rite, maybe hijack a dead servitor's access stamp. But this?" He tapped the slate once. "This was depressingly easy."
Riley stared at him in horror.
She did not understand the intricacies of machine security, not on the level Qin Mo seemed to treat as casual thought. She knew codes, legal permissions, evidence chains, archival locks, and the normal bureaucratic violence of Imperial recordkeeping. That had been enough for her entire career.
Now it was useless. Her final bargaining chip was gone.
Qin Mo tilted his head.
"Your name is Riley Weather, correct?"
The blood drained from her face.
"No."
He typed into the console.
"No, stop."
"Agent Riley Weather," Qin Mo said, reading the file as it opened. "Adeptus Arbites liaison authority. Underhive intelligence attachment. Temporary field jurisdiction granted under emergency rebellion statutes."
Riley lunged against the restraint clamps on her chair.
"No—NO! Stop!"
Qin Mo did not look away from the slate.
"Delete her records."
[Confirmed. Identity purge in progress.]
Riley's breath hitched.
[Deletion complete.]
Qin Mo turned the display toward her.
Her name was gone. Her service record was gone. Her authority markers were gone. The archive no longer recognized her badge number, her warrants, her sealed assignments, or even the transfer authorization that had brought her into Kato.
In the eyes of the Arbites database, Riley Weather had ceased to exist.
The effect on her face was almost educational.
Shock came first. Then fury. Then grief so sudden and naked that even Qin Mo's smile faded by a fraction. Then despair. Then fury again, because anger was easier to survive than emptiness. Finally, confusion settled over her features as the practical implications began to unfold.
No record meant no authority. No authority meant no protection. No protection meant that in the Underhive, she was merely another woman in a room with armed men outside the door and a war eating the city around her.
Qin Mo rested the slate back on the table.
"You will be implanted with the memories of a fallen soldier," he said. "Enough to operate a lasgun, follow field orders, recognize basic cult mutations, and avoid dying in the first thirty seconds."
Riley stared at him. "You wouldn't."
"You tried to use the law as a knife while hiding behind a badge," Qin Mo replied. "Congratulations. You're about to learn what the people under that badge usually experience."
He rose from his chair. The mockery left his voice, replaced by something colder and more official than any Arbites warrant.
"You'll be sent to the battlefield."
Riley's lips parted, but nothing useful came out.
Qin Mo turned toward the door.
"For now, I have more important matters to handle."
The lock disengaged with a metallic clunk. Outside the room stood Grot, massive in power armor, his broad frame almost filling the corridor. The armor's servos gave a low growl as he shifted his weight.
Qin Mo stepped past him and issued the order without slowing.
"Lock her up."
Grot glanced into the room. Riley met his gaze and saw no sympathy there, only tired discipline and the practical indifference of a soldier who had watched too many better people die.
"Understood."
He entered the room as Qin Mo walked toward the briefing chamber. Behind him, Riley's voice rose once more, angry, frightened, and suddenly very human. The door sealed before the words could follow him.
....
The Underground Bunker
Grey lay on a cot in the underground bunker, glaring at the bandaged stump where his arm had been.
It was not the look of a man mourning a limb. Not exactly. Grey had already passed through shock, pain, and the silent calculation of what a one-armed soldier was worth in the Underhive. Now he stared at the wound like it had personally insulted him.
Across from him, Qin Mo worked at a bench crowded with tools, half-disassembled weapons, medical instruments, and flickering holoscreens. Blue-white schematics rotated in the air around him: skeletal diagrams, nerve maps, servo layouts, energy-flow charts, biofeedback loops, and component tolerances so precise that a Mechanicus artisan would either weep or declare war.
Qin Mo seemed completely absorbed. One hand sketched modifications across a suspended holo-panel while the other manipulated a cluster of microscopic circuits with invisible force. Bits of metal lifted, folded, and aligned themselves beneath his attention. Wires threaded through housings. Synthetic tendons tightened and relaxed as if flexing in anticipation.
His goal was not to replace Grey's missing arm.
Replacement was too small a word.
He intended to improve the original design.
"Don't worry," Qin Mo murmured without looking up. "Your new arm will be faster, stronger, more durable, and far more precise than the one you lost."
Grey gave him a flat look. "That is not as comforting as you think it is."
Qin Mo ignored him and tapped one of the schematics. A forearm assembly expanded in the air, showing layered black plating over artificial muscle bundles and embedded gravitic projectors.
"I'm integrating a telekinetic assist module. You'll be able to move nearby objects remotely, pull weapons into your hand, shove enemies off balance, or crush light structures with focused intent. It responds directly to neural impulse, so you won't need gestures unless gestures help you concentrate."
Grey's suspicion deepened. "You're giving my arm witchcraft."
"No. I'm giving your arm engineering that ignorant people will call witchcraft."
"That distinction will be very important when someone burns me."
"Then don't get burned." Qin Mo leaned in closer to another display. "It will also contain a built-in psyker suppression system."
Grey relaxed slightly. "That part sounds useful."
"Powered directly by your heart."
Grey froze.
For a moment the only sounds in the bunker were the hum of the holoscreens, the faint vibration of ventilation machinery, and the distant thunder of fortress guns testing their mounts.
"Wait," Grey said slowly. "What?"
Qin Mo finally looked at him.
"The device requires a stable biological rhythm to regulate field output. Your heartbeat provides an ideal control pattern."
Grey pushed himself up on one elbow. "You're wiring an anti-psyker machine to my heart?"
"In simplified terms, yes."
"And if something goes wrong?"
"There is approximately a one percent chance of complications."
"Define complications."
Qin Mo considered this with the mild seriousness of a man translating a technical manual for livestock.
"Temporary arrhythmia. Severe pain. Brief unconsciousness. Possible involuntary muscle spasms. A very unpleasant tingling sensation in the teeth."
Grey stared.
"Death is not on the list," Qin Mo added. "Trust my craftsmanship."
"I have a bad feeling about this."
"Your original arm wasn't perfect either," Qin Mo said, returning to the work. "Did your back never ache? Did your joints never hurt? Did your fingers never go numb after too many hours holding a lasgun in the cold?"
Grey's mouth tightened.
"Don't be sentimental about flesh," Qin Mo continued. "Flesh bruises, tears, rots, weakens, panics, and dies of infections because a dirty blade entered at the wrong angle. Flesh is useful. Flesh is also a design full of compromises."
Grey looked down at the stump beneath the bandages. His voice dropped.
"My mother died of sickness."
Qin Mo's hands stilled.
Grey did not look at him. "I understand better than most that flesh is fragile."
The bunker seemed quieter after that. Qin Mo's expression shifted, not into apology, but into something more careful.
"Then stop whining," he said, softer than before, "and hold still."
Grey snorted despite himself. "Your bedside manner is terrible."
"My survival rate is excellent."
Mechanical arms descended from the ceiling on articulated rails. Each ended in a different surgical tool: bone clamps, micro-welders, antiseptic injectors, cauterizers, nerve-threading needles, and devices Grey could not identify and did not want explained. Cool antiseptic mist hissed into the air, sharp enough to sting the nose even through the bunker's stale atmosphere.
Qin Mo raised one hand.
The bandages unwrapped themselves. Damaged flesh, sealed vessels, and exposed nerve endings gleamed under sterile light. Grey clenched his jaw and forced himself not to look away.
"This will hurt," Qin Mo said.
"How much?"
"Less than losing the arm."
"That is not a scale."
The surgery began before Grey could complain again.
Metal and flesh met under Qin Mo's direction with terrifying precision. There was no fumbling, no shouted instruction, no servitor chanting medicae litanies while a saw did the work of ignorance. Synthetic bone anchored itself to living tissue. Artificial tendons threaded into muscle. Nerve bundles unfolded like pale roots and linked to artificial synapses.
A sterile blue glow filled the chamber as synaptic welders hummed. Tubes pulsed once, then again, as blood vessels accepted new routes through synthetic channels. Black plating settled over the forming limb in interlocking layers, each plate shifting to match Grey's natural range of motion.
Pain came in waves. Sharp first. Then deep. Then strange, as if his body had discovered a new place to feel agony and was trying to map it all at once. Grey gripped the cot hard enough for his remaining fingers to dent the metal frame.
Qin Mo watched the biofeedback graphs without blinking.
"Breathe."
"I am breathing."
"Angrily."
"That's still breathing."
A final spark leapt across the shoulder joint, bright enough to make Grey's vision flash. Then the pain abruptly changed. It did not vanish, but it organized itself. The new arm stopped feeling like an object attached to him and began to feel like an answer his body was still learning how to read.
Qin Mo lowered his hand.
The mechanical arms withdrew.
"Done."
....
Grey sat up slowly.
The new arm rested at his side, sleek and black, its surface shaped with brutal elegance rather than decoration. The plating overlapped like armor over muscle. Fine sensory nodes glowed faintly along the fingertips. When Grey thought about moving, the hand opened. Not jerkily. Not with the delayed obedience of crude augmetics. Smoothly. Naturally.
He flexed each finger.
The fingertips responded with impossible delicacy. He could feel the texture of the cot beneath them, the temperature of the metal, the faint vibration coming through the bunker floor.
His eyes widened.
"It feels…" He swallowed. "Real."
Qin Mo nodded, pleased but not surprised.
"Better than real, eventually. Your brain still needs time to adapt."
Grey looked toward a battered cup sitting on a nearby crate. He did not raise his arm. He simply focused.
The cup trembled.
Then it lifted from the crate and drifted across the room. Its motion was unsteady at first, then smoother as Grey's concentration sharpened. It settled into his new hand without spilling the last few drops of recaf inside.
Grey stared at it with open awe.
"Even more than before," he whispered.
Qin Mo leaned back against the workbench. "The arm can detect vital signs through touch, analyze airborne toxins, measure structural vibration, interface with compatible machinery, and apply controlled force far beyond normal human muscle output. It responds faster than conscious thought because it reads intent before your body finishes issuing the command."
Grey turned the hand over, watching the fingers curl and uncurl.
"How many functions does it have?"
"Enough that explaining all of them would be inefficient. Use it. Learn it. Don't crush anything important until you know the difference between grabbing and pulverizing."
A slow grin spread across Grey's face.
"This is better than my original arm."
"Obviously."
"I wonder how far you could push augmentation."
Qin Mo's eyes gleamed with a dangerous kind of interest.
"Far."
Grey looked up.
"How far?"
"I could rebuild a man from the cellular level outward. Reinforce bone. Replace weak organs. Improve reflexes. Filter toxins. Add redundant circulatory systems. Harden skin. Rewrite metabolic limits. Make the body into a platform instead of a liability."
Grey chuckled, though the sound carried more unease than humor.
"That's tempting."
Silence followed.
It was not comfortable silence. It settled between them with the weight of everything neither man had said since Kato. Since Laun. Since the cathedral. Since the poison of rank had walked back into the army Qin Mo had dragged from ruin.
Qin Mo broke it first.
"Did you kill Laun?"
Grey went still.
His new fingers closed around the cup. The metal dented slightly before he noticed and forced them to relax. He did not know how to answer.
If he denied it, Qin Mo might think he was lying badly. Worse, Qin Mo might think Grey believed killing Laun had been wrong. If he admitted it, Qin Mo might resent him for acting without orders, for removing a piece from the board before Qin Mo had finished deciding how to use it.
Grey had followed Qin Mo into battles that should have killed them both. He trusted him more than any officer he had ever served. But trust did not make this easy.
Qin Mo watched the hesitation and smirked.
"You did well."
Grey blinked.
"I…"
"Next time," Qin Mo said, lifting one finger, "don't act before I do."
Grey stared at him.
Qin Mo's smirk sharpened. "I wanted to kill him even more than you did."
Grey let out a breath he had not realized he was holding.
"Then why did you show him so much respect?"
Qin Mo's expression became harder to read.
Grey continued, voice lower. "You called him sir. You let him give orders. You acted like he had authority. I thought you were trying to lure him out. Make him expose himself, then finish him personally."
"Not everything must be solved immediately," Qin Mo said.
Grey frowned. "That sounds like an answer designed to annoy me."
"It is also true." Qin Mo turned back toward the workbench. "Laun was useful for revealing people. Who obeyed rank. Who followed competence. Who could be bought. Who resented him. Who feared him. Who watched Riley. Who watched me."
Grey's face tightened.
"And now?"
"Now Laun is dead," Qin Mo said. "So the problem has simplified."
He spoke of murder the way another man might discuss clearing debris from a corridor. Then, as if the matter had genuinely become a footnote, he resumed adjusting the schematics floating above the bench.
Grey stepped closer and looked over his shoulder.
Two designs dominated the hololithic display.
One was clearly a new infantry weapon: compact, rugged, and built around energy efficiency rather than crude output. Grey could understand enough of it to recognize a rifle, even if the internal layout made his head hurt.
The second design was something else entirely.
A detection device, perhaps, though its structure was too strange for any auspex Grey had ever seen. Concentric rings surrounded a crystalline core. Gravitic stabilizers bracketed the frame. Data channels spiraled outward like nerves. Sections of the schematic were labeled in Qin Mo's private notation, dense with mathematics and concepts Grey could not begin to parse.
Grey pointed at it with his new hand.
"What's that for?"
Qin Mo smiled.
Not the mocking smile from the interrogation room. Not the tired half-smile he sometimes gave after a battlefield joke. This one was colder and far more dangerous.
"Now that I control the defensive line," Qin Mo said, tapping the blueprint, "it's time to stop reacting."
Grey studied him.
"We're going on the offensive."
"Yes."
"Against the cult."
"Against the heart of the cult."
Grey's excitement dimmed into caution. "We don't even know where their leader is."
Qin Mo's smile widened.
"We will."
He tapped the strange device again.
"This will find him."
The leader of a Genestealer Cult was not merely a commander. It was the Patriarch.
A monstrous xenos abomination, ancient by the standards of its infestation, massive enough to dwarf men in power armor and strong enough to tear through plasteel as though it were wet parchment. Its body would be a nightmare of alien muscle, chitin, claws, and predatory instinct, but its true danger lay deeper than flesh.
The Patriarch was the nexus. The origin point. The living anchor of the Broodmind.
Through it, the cult's hybrids, acolytes, neophytes, and infected faithful were connected by a shared psychic pressure, not a neat chain of command but something closer to a diseased nervous system spread across an entire population. Orders could move without words. Fear could be suppressed. Fanaticism could be reinforced. Hidden cells could act together before any vox order reached them.
To its worshippers, the Patriarch was prophet, father, god, and proof that their corruption was salvation.
To Qin Mo, it was the root of the infection. And roots could be traced.
His plan was ugly, direct, and practical.
First, force the heretics into an all-out assault. Not a raid. Not a probing attack. Not another infiltrated outpost pretending to be loyal until the knife was already in someone's ribs. A true offensive, large enough that the cult could not coordinate it through ordinary runners, vox relays, or prearranged signals alone.
Let them overextend.
Let them commit their hidden reserves, their psychic assets, their mutant shock troops, their tanks, their broodkin, and every infected commander who thought the Underhive already belonged to them.
Then watch the network strain.
Every command passed through the Broodmind would leave a shape. Every psychic impulse would have direction, delay, intensity, and origin. The device Qin Mo was building would not search for the Warp the way Imperial tools did. It would measure the material consequences of the psychic network: synchronized movement, neural-response patterns, bioelectrical anomalies, gravitational microshifts from massed coordinated action, and the subtle timing differences between thought and obedience across distance.
The cult believed its unity made it strong.
Qin Mo intended to turn that unity into a trail.
Once the device mapped enough of the network, it would trace the signal back through the hidden tendrils of the Broodmind. Back through the commanders. Back through the psykers. Back through the infected cells buried under layers of false loyalty.
Back to the Patriarch's lair.
And when he found it, he would throw everything he had at it.
If the Patriarch could be killed, he would kill it.
If it could not be killed quickly enough, he would rip blood, tissue, and genetic material from its body and use that sample to craft something worse for the cult than death in battle.
A weapon keyed to the infection.
A way to exterminate the entire brood.
Grey listened in silence. The glow from the holoscreens painted the black plating of his new arm in cold blue lines. He flexed the fingers once, slowly, as if already imagining them around a mutant throat.
Then he smiled.
"Whatever you need me to do," Grey said, voice steady with grim devotion. "Wherever you need me to fight. I will go."
Qin Mo looked at him for a long moment.
The bunker hummed around them. Above, soldiers fortified walls, moved ammunition, ate rations made by machines they did not fully trust, and waited for the next attack. Beyond the fortress, the Underhive crawled with enemies who had not yet learned what kind of war Qin Mo intended to bring them.
At last, Qin Mo nodded.
"You will."