Valkorion

Valkorion was an alias of the former Sith Emperor, Vitiate, used as a conduit to create a new faction more powerful than the one he left behind. His new body was a Human male who was the Immortal Emperor of the Eternal Empire during and after the fall of the Galactic Republic and Sith Empire. When the Force entity known as Vitiate arrived on Zakuul, he chose Valkorion to become his new host body, and took possession of the man's physical form. The mind of the original Valkorion was completely suppressed, and his identity was used by Vitiate to build and rule over the Eternal Empire based on Zakuul.