Darth Sevarin

Darth Sevarin was a Dark Lord of the Sith.

Biography
Darth Sevarin, before becoming a Sith, was a member of the B'omarr Monks. After he learned to use the force, the B'omarr Monks mistook it for achieving enlightenment. Unfortunately, as was customary of the B'omarr Monks, his brain was removed and placed in a BT-16 perimeter droid. His anger at having his brain prematurely removed drove him to the dark side. He abandoned the monastary and joined the Sith. His lack of a body hindered his ability to fight, but he compensated by developing his mental abilities. In addition, a vocabulator, a hologram projector, and a series of robotic arms were installed on the droid carrying his brain, enabling him to do everything he couldn't do without a body, including speak and use a lightsaber.

Powers and Abilities
Because he lacked a body, he had absolutely no combat ability, but the his mental abilities were overdeveloped to compensate. His telepathy enabled him to see, hear, and speak despite missing eyes, ears, or a voice and his telekinesis enabled him to manipulate anything around him and defend himself from attacks.

The droid that carried his disembodied brain had very little capabilities, barely able to do anything but walk, but the combination of the force and the modifications done on it solved this problem. The robotic arms installed on the droid carrying his brain enabled him to use four lightsabers at once.