The HK-50 series assassin droid was a HK series assassin/protocol droid model designed by Revan after the Mandalorian Wars. Like their predecessors, these droids possessed incredible linguistic skills and highly sadistic tendencies. The primary function of the HK-50 droids, as they stated it, was to "facilitate communications and terminate hostilities." In accordance with the usual perceptions of HK model assassin droid, the best way to terminate hostilities was to kill everything present. HK-50 units were identical in appearance to HK-47, with the primary exception being that they are "a rather poor shade of durasteel" in color instead of HK-47's rusty red.