Like his comrades Talos and Xarl, Uzas was raised in the poor and crime-stricken heart of Nostramo. He would join the Night Lords Legion during the latter portion of the Great Crusade and would later take part in the epic final battle of the Horus Heresy during the Battle of Terra. At one point he reached the rank of Sergeant for the 4th Claw of the 10th Company, however, the destruction of his squad would lead to him being transferred to the 1st Claw as a standard tactical marine.