HK-47 was a assassin droid and jedi hunter constructed by darth revan shortly after the end of the mandalorian wars. In the wake of widespread destruction caused by the mass shadow generator, a superweapon used during the final battle of that conflict, Revan was inspired to seek more subtle methods of defeating his enemies. HK-47 was sent throughout the galaxy on his missions and successfully assassinated countless targets whom Revan had deemed threats to galactic stability and peace. However, HK-47 was badly crippled and captured on a mission in mandalorian space shortly before Revan himself was captured by the jedi order The assassin droid's memory core was damaged, causing him to forget about his master, and he went from owner to owner, many of whom he inadvertently slew personally.