The Legion Assassin is an enemy that Commander Shepard will encounter if the Commander sold Legion to Cerberus after recovering it from the Derelict Reaper in 2185. Once Shepard reaches the high-security lab in the center of Cerberus' Headquarters, the geth unit will descend a ladder and attack. It is very similar to the Nemesis and has a red laser on its M-13 Raptor.