Interestingly, not much is known about Kserdiek's past before he became a member of the warband; however, it can be argued (albeit weakly) that he is a former Word Bearer based upon his love of daemonic possession and lack of mutations despite his numerous accpomlishments. He studied under the former Chaos Lord Haxir when the warband was still relatively young, and eventually became a champion Possessed Chaos Space Marine. A very intelligent and rational being, Kserdiek used his position as an officer to observe his surroundings, take notes, and intricately plan his rise to Chaos Lord, which eventually paid off when he seized control in 914.M39 after murdering Lord Valkshar.