This ebony astromech droid provided assistance to the Galactic Empire not long after the Battle of Yavin. It found its post on the Executor-class Star Dreadnought known as the Annihilator, which was the flagship of Grand General Cassio Tagge. Subsequently, the droid assisted Darth Vader during a single mission, exploiting its access to information to identify and kill the Imperial officer named Oon-ai. Following this, Vader commanded the droid to initiate its self-destruction sequence after ejecting it into space.