Darth Vitiate is the main antagonist of the Star Wars Old Republic era.
Originally born as Tenebrae, he was the Dark Lord of the Sith who reconstituted the Sith Empire after the Great Hyperspace War and went on to rule it as the Sith Emperor for more than a millennium. Eventually, he grew tired of Sith ideology and created the Eternal Empire, which he ruled as Valkorion, planning to consume almost all life in the galaxy in order to become an all-powerful god and rule the rest of the universe unchallenged. He is also the archenemy of Revan.
He is voiced by Doug Bradley as Vitiate, who also played Pinhead from Hellrasier. As Valkorion, he is voiced by Darin De Paul, who also voiced Ardyn Izunia from the Final Fantasy series, Trade Prince Gallywix from World of Warcraft: Legion, Samuel Hayden from 2016s Doom, Zeron Alpha from 3Below, J. Jonah Jameson in Marvel’s Spider-Man video game, and Bular from Wizards. As Tenebrae, he is voiced by Anthony Skordi.
He is the unseen overarching antagonist of Star Wars: Knights of the Old Republic and its sequel Star Wars: Knights of the Old Republic II: The Sith Lords, as well as the main antagonist of the novel Star Wars: The Old Republic: Revan.
Vitiate is also one of the two main antagonists (alongside Darth Malgus) of the BioWare MMORPG Star Wars: The Old Republic, serving as the main antagonist of the Jedi Knight storyline, the overarching antagonist of all the other class storylines and Shadow of Revan, the main antagonist of the Rise of the Emperor storyline, the overarching antagonist of Knights of the Fallen Empire, one of the two main antagonists (alongside Vaylin) of Knights of the Eternal Throne, the main antagonist of the Echoes of Oblivion storyline and the posthumous overarching antagonist of Onslaught and Legacy of the Sith.