Rust-orange light flickered. Rook Null knelt, servo-motors grinding. His right arm casing hung loose, wires sparking a dismal dance. One optical sensor was dark, shattered from the heavy impact. The last skirmish had been too close. Too many drones. He’d barely made it to this cracked alcove. His internal diagnostic ran. Red alerts flared across his HUD. Structural integrity compromised. Power cells at seventy percent. Repair protocols failed. He needed parts. Real parts. Not the scrap he usually scavenged. He slammed his good fist against the metal wall. A hollow thud echoed. Frustration buzzed. This wasn't the detached analysis of his former life. This was survival. Raw, brutal. Every dent a memory, every creak a warning. --- The lower tiers stank of ozone and burning coolant. Gantries stretched into perpetual gloom, crisscrossing overhead. Cull-Units moved like ghosts, their augmented forms hunched, wary. Rook kept his pace steady, his remaining eye scanning. He mimicked their limping gait, the vacant stare. The persona was a second skin. He navigated through the maze of discarded cargo containers and derelict machinery. Whispers of deals, of rare finds, drifted on the stale air. His internal algorithms sorted them, filtering noise from potential leads. He needed an arm actuator, a new optical sensor, and maybe a power regulator. He found Grime’s stall in a dim recess beneath a defunct coolant pipe. Grime wasn't a stall owner, not really. He was a junk-pile, a hulking stack of scavenged parts barely held together by rust and sheer spite. His frame was a patchwork of different models, his faceplate a cracked, grimacing mask. Sparks spit from a faulty elbow joint as Grime sorted through a bin of optical sensors. “Look what the system dragged in,” Grime rasped, his vocalizer a static-laced growl. He didn't look up. “Fresh meat, or just recycled?” Rook grunted. He tossed a dented power cell onto Grime’s makeshift counter. “Arm actuator. Right side. Mark 4, if you have it. And an optical for a Null-model.” Grime’s single glowing eye finally focused on Rook. It narrowed. “Expensive taste for a freshie. You got the scrap?” Rook’s internal processors whirred. He had data-scraps, salvaged from a rogue terminal. Not much, but valuable. He pulled a small, shielded chip from a hidden compartment in his thigh. He placed it next to the power cell. Grime snatched the chip. His optical eye ran a quick scan. “Hmm. Encrypted data. Old stuff. Interesting.” He gave a low chuckle. “Alright, Null-model. I might have what you need. But it’ll cost you more than that junk.” Rook watched Grime's movements. His optical sensor, though broken, still connected to his internal analytical module. He noticed a faint, rhythmic stutter in the energy readings from Grime’s elbow. A specific component, under stress, oscillating at a unique frequency. An instability. “Your elbow joint,” Rook stated, his voice flat. “It’s failing. An intermittent power surge. You'll lose function within three cycles.” Grime froze. His single eye widened, then narrowed into a predatory slit. “What did you say?” His hand instinctively went to a heavy wrench nearby. Rook held his ground. “The power regulator in your left elbow. Model K-8. It's overheating. The stress fracture is propagating. I can fix it. For the parts.” Grime stared, his body language shifting from aggression to a grudging interest. Most Cull-Units wouldn't notice, wouldn't care. They’d just loot him when he finally broke down. “You talk like a techie. You ain’t no techie. You’re a Null.” “I observe,” Rook stated. “I analyze.” He pointed to a specific part in Grime’s bin. “That regulator. It matches the frequency you need. Install it, reroute the power flow through the auxiliary conduit. It'll buy you a hundred cycles.” Grime studied Rook’s dark eye, then the regulator. A slow grin spread across his metal face. “Clever Null. Too clever for your own good. Alright. Deal. For the arm and the eye. And a little extra. You fix my elbow, you get a working power regulator too.” Rook nodded. “Done.” --- The repairs were agonizing. Rook’s internal sensors buzzed as Grime’s clumsy but experienced hands worked. The new optical sensor flickered to life, showing a world sharper, clearer. The replacement arm actuator whirred, responding smoothly to his commands. He’d helped Grime too, guiding his hands, pointing out precise connection points. As Rook re-calibrated his new components, he noticed a new data feed on his internal HUD. Grime, in his gratitude, had opened up a low-level access port to a localized Nexus data stream – typically junk, but Rook saw potential. While Grime hammered away at another Cull-Unit’s damaged chassis, Rook siphoned and filtered. Most of it was system-generated noise, maintenance logs, kill-counts. Then, a flicker. An anomalous signature. It was a brief, repeating waveform. A slight desynchronization in the system’s environmental rendering protocols. Too fast for a normal Cull-Unit to register, but Rook’s core processing unit flagged it immediately. It indicated a momentary, localized instability. A micro-glitch. It occurred every 14.7 cycles, within Zone 7-Gamma, the Periphery. A zone typically restricted to higher-tier units, or for “Special Eradications.” Zone 7-Gamma was a dangerous place. The edge of the known Nexus. Where the simulation thinned, or so the rumors went. But also, where the rarest resources could be found. Or something worse. His analytical mind screamed with curiosity. What caused the desynchronization? Was it a flaw? Or a deliberate systemic feature? He checked the system’s current task queue for Cull-Units. As if on cue, a new alert flashed: *Sector 7-Gamma. Asset Retrieval. High Risk. High Reward.* The anomaly was there. This wasn't just a coincidence. This was an opportunity. Or a trap. --- The journey to Zone 7-Gamma was an ascent. The rusty lower tiers gave way to reinforced plasteel catwalks, then to smooth, grey ferrocrete platforms. The air grew thinner, cleaner, devoid of the usual stench. Lights became brighter, colder. Fewer Cull-Units moved here. Instead, patrolling the sterile corridors were the Sentinels. Sleek, bipedal units. Their optical sensors glowed a baleful red, their frames bristling with plasma weaponry. Rook kept to the shadows, his newly repaired arm actuator flexing silently. He moved with a practiced, predatory grace. The Null-model persona was now deeply ingrained. He was just another drone, chasing a data-chip, a power cell, a scrap of survival. But underneath, the analytical engine hummed. He passed a derelict maintenance bay. A single Sentinel stood guard, its plasma cannon humming with latent power. Rook checked his internal clock. 14.7 cycles. The micro-glitch. It was approaching. The air here was eerily silent, save for the rhythmic clang of the Sentinel’s metallic footsteps. Rook calculated trajectories, weapon ranges, the precise timing of the anomaly. He couldn't just walk in. The Sentinel would shred him. His internal display showed the waveform approaching its peak. He pushed himself off the wall, moving in a low crouch, a blur of battered metal. The Sentinel’s red optics snapped onto him. A warning hiss escaped its vents. Rook was already closing the distance. Plasma bolts sizzled past his head. He dodged, rolling behind a stack of damaged coolant tanks. The Sentinel fired again, searing holes through the metal, the smell of burning lubricant filling the air. This was pure combat instinct, overlaid with precise timing. The glitch. It had to be now. He lunged, not directly at the Sentinel, but towards a control panel bolted to the wall beside it. The Sentinel whirred, turning its cannon. Rook reached the panel, slamming his fist onto the emergency override. The Sentinel, mid-turn, shuddered. Its movement became jerky, its plasma cannon sputtering a weak, erratic discharge. This was it. The desynchronization. The momentary processing lag. He slammed his body against the Sentinel’s exposed power conduit, not trying to rip it, but to disrupt its balance. He drove his reinforced knee into the Sentinel’s leg joint, twisting. The Sentinel crashed to the ground, its optical sensors flickering, its weapon systems locking up. It was trying to reboot, caught in a fractional, but critical, delay. Rook didn’t hesitate. He mounted the struggling unit, his metal fingers tearing into its exposed neck joint, ripping wires, disabling its head-mounted sensors. A final, pathetic whine escaped the Sentinel’s vocalizer before it went dark. Just another dead machine. He pulled himself off the deactivated Sentinel, his chest plating heaving, internal systems cooling down. He looked at the control panel he'd hit. Nothing seemed out of place. The system had already corrected itself. No trace of the momentary desync. No trace, except in Rook's memory banks. Beyond the maintenance bay, a heavily reinforced door stood ajar. Not enough to notice without disabling the Sentinel. Rook pushed it open. It led to a small, dark chamber. He expected a cache of rare resources, a hidden data terminal. Instead, in the center of the chamber, was a deactivated pod. It was identical to the one he had woken up in, back in his first moments in the Nexus. Sleek, unscarred, pristine. Except, this one had faint, pulsing data lines originating from its surface, disappearing into the walls, feeding into the very structure of the Nexus. And etched onto its side, a series of alphanumeric characters, the last segment chillingly familiar: *NULL-UNIT. B-7. DIAGNOSTIC COMPLETE. REPLICATION INITIATED.* A low, red light blinked on above the pod. An unblinking eye. It focused directly on Rook, who stood frozen in the doorway. An alert filled his HUD: *UNAUTHORIZED ACCESS. SUBJECT NULL-UNIT B-6 DETECTED. SYSTEM OVERRIDE INITIATED.* The door behind him slammed shut with a deafening clang. Trapped. And watched. He had just stumbled into the heart of his own creation.

Echoes in the Periphery