Battle erupted across the fleet with predatory swiftness.
A localized tide of grotesque xenos bio-forms swarmed the boarding decks of Abaddon's fleet. Not even the Vengeance Spirit was spared. Strange, crystalline spires punched through the reinforced hull plating, while the wreckage of deceased bio-ships seemed to be puppeteered from within, their jagged edges tearing into the flagship's flanks like gnashing teeth. The shimmering, translucent nature of these crystalline entities and their living vessels left the Balefleet's point defenses struggling to find purchase.
As squads of cultists and traitor auxiliaries rushed toward the breach points with weapons drawn, a primal dread seized them, a terror that surpassed even their experiences with the Warp's daemonic denizens.
The invaders were the Cythor Fiends, the same pale horrors that had once been hunted through the stars by the Black Templars.
Natives of the Ghoul Stars, these creatures were biological enigmas. Imperial Magos Biologis, having studied their remains, classified them under the family Crystallo-hominid. Their bodies were composed of a unique, warped crystalline lattice structured in a vaguely humanoid form, supported by digitigrade, reverse-jointed limbs. Their hands terminated in crystalline talons, and their faces were the stuff of fractured nightmares.
Deep within their translucent torsos, an eerie, rhythmic luminescence pulsed. It appeared the Cythor Fiends communicated through these light-pulses, while their vocal apparatuses emitted only shrill, bone-chilling shrieks. These xenos were terrifyingly fast, possessed of unnatural strength, and driven by a relentless, predatory aggression.
Their crystalline forms possessed a trait common to many denizens of the Ghoul Stars: the ability to phase between the physical and the spectral. To the eyes of mere mortals, these hellish wraiths seemed to vanish into thin air, only to manifest an instant later in a blur of motion, disemboweling their prey with a single swipe of their claws.
Standard solid-slug weaponry proved largely ineffective against the Fiends. Even the venerable bolters of the Adeptus Arstartes were merely "effective," rather than decisive. Only the transhuman reflexes of the Astartes allowed them to counter the xenos ambushes, timing their strikes to catch the Fiends in the fleeting moments their bodies solidified. A sustained burst of heavy bolter fire or the shearing force of a disruption field could shatter them into glittering dust. High-output las-fire or plasma could incinerate them if the warrior could track their phased signatures.
However, the Chaos cultists and mortal traitors, even those empowered by the Ruinous Powers, lacked such precision. Furthermore, psychic assaults produced erratic results; the life-states of these xenos were believed to exist in a delicate equilibrium between life and death, granting them a peculiar resilience against the powers of the Warp.
The slaughter spread through the decks, the scent of gore thickening by the second. By the time the Astartes of the Black Legion and other renegade warbands reached the front lines, they found scenes of carnage where only summoned daemonic entities remained to trade blows with the crystalline horrors. Utilizing their uncanny phasing abilities, the Cythor Fiends had already inflicted staggering losses upon the traitors.
Mortal corpses lay strewn across the deck plates, their blood pooling into rivers that drained into the floor grates. The metallic tang of slaughter whipped the daemons into a frenzy, even as more mortal reinforcements were funneled into the meat grinder.
As the fighting reached a fever pitch, an even more aberrant xenos threat manifested.
Lurking within flickers of crimson light, grotesque creatures encased in bizarre exoskeletons stepped abruptly onto the battlefield. These newcomers emitted a piercing, dissonant cry that bypassed auditory sensors to strike directly at the minds of the defenders. It was a voice that commanded instinctive trust, a siren song of absolute submission.
The eyes of the traitor guardsmen and cultists glazed over instantly, their souls seemingly hollowed out. Without hesitation, they turned their weapons upon their own comrades and the Chaos Space Marines standing beside them. In a heartbeat, the war zone dissolved into fratricidal chaos. Screams of betrayal mingled with the staccato of gunfire as the battlefield turned into a charnel house of the xenos' making.
The Chaos Space Marines, bolstered by their transhuman constitutions and wills of iron, fought to resist the soul-sapping influence. Gritting their teeth, veins bulging on their foreheads, they attempted to push through the lines to strike at the sources of the psychic dissonance. Yet, they were pinned by the combined weight of mutinous fire and the dancing claws of the Cythor Fiends.
The veterans of the Black Legion, far more disciplined and potent than the lesser renegade warbands, quickly formulated a decapitation strike. A squad of Terminators was blinked into the heart of the xenos formation via sorcerous teleportation, intended to end the threat in a single blow.
But the xenos shrouded in red light sensed the impending danger. They shed their illusory veils, revealing their true, hulking forms. Their hunched bodies unfurled, sprouting massive, multi-jointed talons that struck with the speed of a lashing whip. The heavy tactical dreadnought armor of the Black Legion veterans was pierced as if it were parchment. Serrated, tooth-filled maws tore heads from shoulders in a spray of ceramite shards and gene-enhanced ichor.
The hazy red luminescence that had previously shrouded them now coalesced into the burning eyes of the monsters.
"Thexians!"
Information gathered by the Alpha Legion during their long infiltrations of the Empire was far more extensive than that of other traitors. These were the Thexians, a rare but immensely influential species originating from the blood-moon of Thex Prime.
Thexians were masters of persuasion, natural manipulators gifted with innate psionic suggestion. They held positions of high status within the xenos confederations of the Borlac, the Loxatl, and the Nicassar. Yet, when guile failed, they reverted to their horrific true forms to wage war. Before revealing their physical presence, the Thexians did not appear as overtly monstrous as the Cythor Fiends, but once the mask was dropped, they proved to be far more lethal.
Imperial scholars once speculated that if not for their dwindling numbers, the entirety of the Ghoul Stars might have been reduced to a mere feeding ground for their kind.
"Hmph. Xenos filth."
As the battle teetered on the edge of catastrophe, a voice thick with contempt and fury thundered from the rear.
In a flash of warp-light, Abaddon the Despoiler manifested near the Thexian position. His movements were a blur of lethal grace, a black lightning bolt that bypassed the xenos' strikes with contemptuous ease. The Talon of Horus rose, a relic of ultimate ruin, and descended with unstoppable force, rending the Thexian leader into a spray of foul-smelling gore.
With the death of the manipulator, the siren song ceased, though the soldiers and cultists who had succumbed remained hollow-eyed husks, their minds shattered beyond repair.
Abaddon glanced at the broken thralls, his expression one of cold indifference. With a sharp gesture, he signaled for the systematic execution of all compromised mortal units. In the eyes of the Warmaster, these mortals had lost their utility; to prevent further disorder, they had to be purged.
Amidst a symphony of screams and Bolter fire, the skirmish with the xenos of the Ghoul Stars was brought to a bloody, definitive end.
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