Void Reavers

The Void Reavers were a Slaanesh-devoted Chaos Space Marine warband of the Red Corsairs which fought in the Glory Wars and the Fall of Tectonia Prime. Originally led by the Master of Possession Gygak Thrice-Born, the warband came to be led by the daemon prince Ghor Dranas after the Fall of Tectonia Prime.

Formation and Involvement in the Glory Wars
Gygak was tasked by the tyrant-king of the Red Corsairs to rally wayward warbands to his banner as the Cicatrix Maledictum provided an unprecedented opportunity for reaving the Imperium Sanctus. His ire was particularly directed against those lackeys of Abaddon and the wheezing followers of Mortarion. Gygak - once Astartes, then heretic - sought a dark council with one of The God of Pleasure & Pain's servants. Unbeknownst to them, Gygak offered up the immortal souls and mortal forms of his raiding party in exchange for the cohabitation of his body with a daemon, becoming the Thrice-Born.

Though they committed themselves furiously to the Glory Wars, the Void Reavers were brutalized by the combined forces of the Corpsemakers, the Bloody Eye, and finally the Court of the Onyx King across the worlds of Abner's Reach.

Aftermath of the Glory Wars
Disgraced and embittered by their abject failure, the Void Reavers fell even further into dark pacts and damnation. Their battle cry, "Power Corrupts!" became writ across their twisted features as they committed themselves to the bed of the Youngest God.

Gygak Thrice-Born lost the favor of his patron and leadership of the warband was gifted to the daemon prince Ghor Dranas, Chosen of the Dark Prince.

Heeding the words of Blackheart himself, the warband sought ever bigger guns and negotiated a tenuous agreement with the infernal Knight household Vextrix, enlisting the aid of the ancient Desecrator the Hammer of Beta-Garmon (with the promise of more to come).