The Hounds of Abaddon are a special formation of Chaos Space Marines found within the Black Legion who are wholly dedicated to the service of Khorne. Within the ranks of the Black Legion, the greatest of the Traitor Legions which serves Chaos Undivided, there still exist thousands of devotees of the Blood God Khorne. These Khornate Berserkers are always at the forefront of the Legion's assaults, charging and howling into the fray. These formations are known as the Hounds of Abaddon, who revel in close combat, where they can spill the greatest volume of blood for their god, using razor-toothed Chain-Axes, wicked Lightning Claws or even their own mutant fangs.
Though the Hounds are not a single unified warband within the Black Legion, they were once led by Urkrathos, the former Lord Purgator of the Chosen of Abaddon and commander of the Legion's Black Fleet. Urkrathos claimed all followers of Khorne within the Legion as his own and directs them according to the will of Abaddon the Despoiler, the Legion's Warmaster.
Following Urkrathos' death on Cadia during the 13th Black Crusade, the command of the Hounds of Abbadon, as well as the position of Lord Purgator and Admiral of the Black Fleet, fell to another Chaos Lord within the Black Legion in service to the Blood God, Threxos Hellbreed. Hellbreed has won great favour with his patron, Khorne, due to his skills at launching ship-to-ship ambushes. He has earned a reputation for initiating spectacular boarding actions.
- Black Legion: A Codex: Chaos Space Marines Supplement (6th Edition) (Digital Edition), pg. 58
- Codex Heretic Astartes - Chaos Space Marines (8th Edition), pg. 19
- Gathering Storm - Book One - Fall of Cadia (7th Edition), pp. 36-53