Click.
Boom! Boom! Boom!
A succession of sudden, violent detonations erupted from the labyrinth of skyscraper-sized research installations.
Three heavy-caliber explosive shells struck an Adaptive Combat Core mid-sweep, blooming into interlocking clouds of searing plasma and blinding fire.
The architect of the ambush was a towering, six-meter-tall humanoid automata.
Though its heavily armored frame appeared bloated and cumbersome, its operational movements were deceptively swift. A large-caliber assault grenade launcher hung from its left arm-mount, while its right terminated in a shimmering power claw. The machine's short, robust bipedal joints churned in a rhythmic, deafening cadence, sending heavy metallic vibrations echoing through the deck plates.
As it advanced, its upper chassis maintained absolute gyroscopic stabilization, the assault grenade launcher continuously hammering salvos into the smoke.
The entity's immense structural mass effortlessly absorbed the punishing kinetic recoil of its primary ordnance.
Under normal circumstances, any battlefield combatant would be hard-pressed to maintain composure when a walking piece of artillery was closing the distance at high velocity while maintaining a continuous rate of fire.
Fortunately, Iron Men felt no fear, and the Adaptive Combat Core possessed no mortal face to pale.
The crimson optical sensors of the attacking automaton pulsed with a rhythmic, malicious light.
"Active target detected. Initiate termination protocol."
The flat, synthesized vox-output droned with monotonous, unyielding repetition.
Zzzzt!
A thick, blindingly brilliant beam of azure energy pierced through the boiling smoke of the secondary explosions, instantaneously vaporizing the main torso of the charging machine.
As the fires dissipated, a heavy weapon barrel slowly dissolved back into the liquid-silver surface of the morphing orb.
Clatter!
The remaining shattered segments of the automaton's chassis skitted across the ground, propelled by dying forward momentum.
Axion felt no inkling of surprise at the hostiles' sudden aggression.
The city's supreme administrative mainframe had severed all external data networks and left behind a single, unyielding directive: Annihilate all moving targets.
When the central intelligence originally realized its sovereign clearances were being forcibly stripped away, it lacked the temporal cycles to calculate whether the infiltrator was a flesh-and-blood saboteur, a remote-controlled proxy, or a rogue cybernetic unit. To preserve the irreplaceable assets of the Federation, the most logical countermeasure was the total eradication of any active entity within the perimeter, extinguishing a thousand innocent units rather than allowing a single infiltrator to escape.
As for the specialized combat machinery under the mainframe's command, their physical architecture featured distinct, hardcoded optical signifiers. Even when severed from the primary quantum network, they remained perfectly capable of mutual friend-or-foe recognition, preventing catastrophic friendly fire.
This extreme logical directive had proven thoroughly effective; the stranded researchers who descended into the city had been forced into a brutal war of attrition against a sea of their own autonomous guardians.
The violent kinetic discharge of the first ambush quickly drew the attention of nearby sentries.
Unbroken automata began emerging from the shadow of the surrounding structures, resuming the relentless search-and-destroy patrols they had carried out ten thousand years prior.
These roaming sentry units quickly collided with more of Axion's scattered Adaptive Combat Cores.
Against machines engineered specifically to endure the extreme environments of this specialized research hub, standard or even frontline military hardware would have ground to a halt.
Yet, the Adaptive Combat Cores forced their way through the opposition, relying on localized temporal solidification and regression modules to systematically execute their mission.
Engagements between purely cybernetic entities were far more clinical than the desperate, grinding skirmishes fought between the Adeptus Astartes and renegade warbands.
Target acquisition, instantaneous kinetic discharge, and immediate structural annihilation.
The data arrays of the Adaptive Combat Cores allowed them to rapidly reconfigure their physical frames, manifesting counter-measures or entirely new weapon systems at a moment's notice.
So long as their caliber outmatched the target's armor profile, there was nothing they could not reduce to scrap.
The defensive automata were being systematically disassembled at a staggering rate, while the losses suffered by the Adaptive Combat Cores remained mathematically negligible.
The defenders' plasma burst grenades and conventional high-explosive ordnance were almost entirely absorbed by the cores' adaptive shielding. Meanwhile, the specialized close-quarters units wielding power claws and particle blades were utterly obliterated long before they could cross the engagement threshold.
That being said, as the automated guardians of a prime Federation research enclave, certain elite variants were outfitted with highly non-standard weaponry.
A cluster of several hundred combat cores was suddenly wiped offline along the perimeter of a structure designated as the Special Weapons Research Laboratory in the northern district.
Their destroyer was a uniquely modified combat machine.
Standing eight meters tall, the humanoid machine was equipped with a pair of esoteric power gauntlets.
Its method of execution defied conventional physical logic.
Positioned tens of thousands of meters away from Axion's vanguard, the specialized automaton suddenly threw a sequence of heavy strikes into the empty air. The kinetic force of its power gauntlets seemed to completely bypass physical distance, materializing instantly within the immediate spatial coordinates of every locked target.
Within a microsecond, every targeted combat core was shattered into base components.
Furthermore, the cores struck by this anomalous vector instantly lost their capacity to initiate temporal regression.
Their structural particles were utterly unmade, reduced to disintegrated atomic dust.
Faced with a weapon profile that contradicted known physical paradigms, Axion did not hesitate. He directed a massive torrent of nanites to surge forward, completely overwhelming the elite machine beneath a gray tide.
He was entirely prepared to sacrifice a portion of his nanite mass to the corrosive materials of the Warp if it secured the data.
Through the frantic efforts of his dissolving nanites, Axion successfully extracted the technical specifications of the specialized unit:
Model Designation: XUD-04 — Hyper-Guardian Integrated Systems: Hyperspace Offensive Module, Temporal Flashback Module. Supports multi-weapon adaptation.
Accompanying the registry codes was an un-archived engineering note left behind by an anonymous researcher within the machine's memory banks, finally clarifying the mechanics behind its anomalous striking profile.
The Hyperspace Offensive Module was a prototype apparatus that utilized refined spatial energies siphoned from the Immaterium. When channeled through a physical weapon system, it allowed the machine to disregard realspace distances entirely, effectively punching through folds in space.
The Temporal Flashback Module utilized isolated temporal energy to mark a sequence of combat movements. Upon target acquisition, it would flash the machine's physical state back to the exact microsecond the strike was initiated, repeating the attack simultaneously across every designated coordinate.
The synergy of these two experimental modules produced the instantaneous, multi-directional devastation Axion had just witnessed.
As for the power gauntlets themselves, they were a form of hyper-oscillating shockwave weaponry.
The catastrophic energy fields generated at the point of impact were engineered to grind everything within the detonation zone to powder.
Under normal realspace constraints, this weapon possessed a critical structural flaw: if used at close range, the resulting shockwave would systematically tear the wielder's own chassis apart.
Yet, to utilize a pair of melee power gauntlets as a long-range artillery platform was a magnificent subversion of physical law.
The Federation's forbidden research into empyric energies had given this otherwise impractical weapon concept a devastating new purpose, transforming it from a localized shockwave explosive into a god-like instrument of warfare.
The combination of sub-space translation and temporal echoing allowed the XUD-04 to strike hundreds of separate targets across vast distances within the exact same second.
The shockwave gauntlets provided more than enough destructive force to shatter realspace matter, and because the strikes were laced with raw temporal energy, they completely disrupted the temporal solidification matrices of the adaptive cores.
With the analysis complete, Axion commanded his forces to scour the interior of the Special Weapons Research Laboratory. However, the facility had long since been reduced to a hollowed ruin by the initial cataclysm; the volatile eruption of unrefined Warp energy had obliterated every piece of critical infrastructure within its walls.
As the remaining Adaptive Combat Cores pushed deeper into the surrounding sectors, they began discovering the scattered, broken chassis of the automated iron frames that had once housed the consciousnesses of the Federation researchers.
Countless millennia had passed, and the biological remains of the human scientists within those iron shells had completely vanished. Yet, every single machine that had served as a vessel for a human mind bore the unmistakable, catastrophic scars of extreme, high-temperature thermal purging.
It was a grimly logical revelation. It explained precisely why Axion had encountered no daemonic entities or warp-spawn since entering this silent metropolis.
The automated defense systems of this facility possessed clear, uncompromising protocols regarding any biological asset that came into direct contact with the corrupting influence of the Immaterium.
Flames would purge all things.
Yet, even as the optical sensors of the combat cores scanned the scorched, empty husks of the ancient machines, faint and distorted humanoid shadows could be seen through the static, wandering aimlessly through the ruins.