The Scarab Mark 3 Assassin Droid, generally referred to as sleeper droids, came from Sienar Intelligence Systems, which was a branch of Santhe/Sienar Technologies. These imitation assassin droids utilized three repulsorlifts to levitate, possessed a stun blaster and a dart launcher as weaponry, and had an electrically charged outer layer for defense. The Mark 3 was engineered to seize targets alive instead of eliminating them, adhering to the legal restrictions of the Galactic Republic that forbade assassination droids. The earlier models, Mark 1 and Mark 2, were deemed illegal due to their lethal capacity; these earlier versions were primarily employed by bounty hunters and Separatist operatives for carrying out assassinations.