Uzas was a Khornate Berserker and the former Sergeant of 4th Claw of the Night Lords Traitor Legion. He would eventually join 1st Claw and serve under the leadership of Talos Valcoran on the Strike Cruiser Covenant of Blood, which was captained by the Possessed Chaos Space Marine known as "The Exalted". He was despised by his comrades in 1st Claw for his mindless slaughter of crew slaves and undisciplined nature in combat.