Abyssus

Lord Abyssus, born Savage Opress, was a Dathomirian Sith Lord. In 20 BBY, he was killed at the hands of Darth Sidious, however was revived by the Dathomirian Clan Nightsisters. When Order 66 ensued, he became a Sith Lord and inquisitor. He was given the title Abyssus by Sidious at his revival, when he rejoined Dooku.