Flames of the Lambent Shadow

The Flames of the Lambent Shadow were a warband of unknown origin, dedicated to the worship of . Operating out of various in the southwest, the Flames of the Lambent Shadow were known for their use of trickery and subterfuge to undermine rule and abduct Imperial citizens, using astropathic "siren songs" to lure voidships into their grasp and seeding vox relays with psychic whispers of forbidden knowledge. When engaged in overt combat, the Flames were known for their usage of particularly bizarre and esoteric forms of , such as dousing foes in black flames that would reduce their victims to burning puddles of continually-mutating liquid flesh, or impaling them on spears made from the torn-out fabric of spacetime, freezing their victims forever in an eternal instant of painful final consciousness.
Also of note was their (supposed) leader, a shapeshifting entity known only as The Formless One. Never seen interacting with its alleged servants, The Formless One seemed to operate on an entirely separate and unrelated agenda to the Flames, their relation only known by the Flames' unwavering insistence that their actions were guided solely by the exacting instruction of this proclaimed leader.