Darth Spectorus

"You are civilized for a sith" - Obi Wan Kenobi (force ghost) Darth Spectorus was a male human sith lord who was one of the apprentices of Darth Nihlius. Darth Spectorus served Nihlius in tell his master drained most of his life essence, he was able to escape and survive but it left him in a form similar to his master. He then later discovered the ability to keep your spirit in the physical realm and effect it which he used after he was killed by Revan on his ship the helixer. He later befriended Obi wan Kenobi in the afterlife 5 years after kenobi's death. In 80 Aby he passed his knowledge onto a the second sith eternal emperor Darth Corruptorem.

Skills and abilities
Force powers:

Force lightning Force speed

Force storm

Force drain

Force eternal (His unique ability to remain a ghost in the physical world and effect it)

Force mind probe

Force fracture

Force control (able to control peoples minds)