During 20BBY CT4 and the rest of the twenty seconed would be assainged to help "Jedi master" J'asar Hytwol to disable a key droid factory in the outer rim. Through the mission CT4 would become close with J'asar. CT4 would witness the deaths of all of his comrades on the way to the factorys core. But due to the fact the detanator was lost on the way, grieve volunteered to manually detonate the bombs, both CT4 and Hytwol wouldn't argue and fled the factory before greive blew up the factory. After the mission CT4 would continue grives tradition of scratching a line into his armor for every brother who fell in combat.