KJ-931 was an experimental assault Skytrooper, a type of battle droid used by the Eternal Empire of Zakuul. In 3632 BBY, it was onboard the Eternal Flagship of Emperor Arcann, when the Emperor received from SCORPIO the location of the Anti-Zakuul Alliance base of Odessen and took the flagship and a cizeable portion of the Eternal Fleet there. In the ensuing Battle of Odessen the flagship was boarded by the Alliance forces. KJ-931 encountered and engaged Lana Beniko and the Alliance Commander, but was defeated and killed.