Urkrathos, also sometimes called Urkanthos, was a Chaos Lord of the Black Legion of Chaos Space Marines and the former Lord Purgator of the Chosen of Abaddon. Within the ranks of the Black Legion are those who are bloody-handed servants of Khorne. Though not a single unified warband within the Black Legion, they are collectively known as the Hounds of Abaddon. Urkrathos, the current Lord Purgator and commander of the Legion's Black Fleet, claims all followers of Khorne within the Legion as his own and directs them according to the will of Abaddon the Despoiler, the Warmaster of Chaos and master of the Black Legion. It falls to the Lord Purgator to ensure that every man, woman and child left alive on a world conquered by the Black Legion is dragged in chains into the hold of the Legion's starships, and that no edifice remains undedicated to the Dark Gods.
During the final stage of the 13th Black Crusade in 999.M41, Urkrathos achieved daemonhood and became a Daemon Prince after pleasing Khorne with the mass slaughter and loss of life caused by the destruction of three great Imperial warships in the Cadian Gate. The ascension of Urkanthos to daemonhood came as the Black Fleet approached Cadia for its second assault upon the world. Surging in towards the Fortress World, Urkanthos had faced a trio of enemy Battleships whose captains had determined that -- if they could not defeat the oncoming Chaos horde -- they would at least slay the ﬂagship of its ﬂeetmaster. Through guile, ferocity and unmatched skill did Urkanthos captain his craft to victory over all three Imperial warships, blasting two to ruin before obliterating the final craft as it turned to ﬂee. Such a mighty tally of blood and skulls pleased Khorne greatly, and bought Urkanthos the reward of immortality that he had long sought. So did the master of the Hounds of Abaddon become more fearsome than ever before.
Ironically, Urkrathos was slain on Cadia itself just before its destruction combatting Saint Celestine and her two Geminae Superia, the Living Saint's protectors, the former Adepta Sororitas Canonesses Eleanor and Genevieve of the Order of Our Martyred Lady. Urkrathos had previously killed both in combat before their resurrection.
- Black Legion: A Codex: Chaos Space Marines Supplement (Digital Edition), pp. 55-63
- Codex: Chaos Space Marines (3rd Edition, 2nd Codex), pg. 10
- The Gathering Storm - Book One - Fall of Cadia (7th Edition), pg. 38