Jeddek was the Standard Bearer of the World Eaters 8th Company's Command Squad under First Captain Kharn during the Great Crusade and Horus Heresy. One of the oldest members of his Legion, he was one of the original recruits from Terra and fought in the legion when it first began fighting in the Great Crusade. One of the first members of the Legion subjected to the implantation of the Butcher's Nails, Jeddek had worn it nearly as long as anyone save Angron himself. This long exposure had resulted in him feeling no emotion outside of carnage and displaying nothing other than rage. During the Shadow Crusade, Jeddek was killed on Nuceria by the Ultramarines.