These training droids existed at the Sith Academy located on the planet Umbara throughout the duration of the Clone Wars. J77, A79, S81, and T87 were the designations given to these four droids. Their design shared similarities with IG-100 MagnaGuards, incorporating the head of an assassin droid and equipping them with electrostaffs analogous to those used by the MagnaGuards. Every one of these droids recited segments of the Sith Code, but they were all ultimately obliterated by a single Jedi Knight amidst the Clone Wars.