Deral Thul was a male Human member of the Alderaanian Great House of Thul who served as a Sith Lord of the resurgent Sith Empire during the Alderaan Civil War, a part of the galactic Cold War between the Sith and the Galactic Republic. During the war he was station on his homeworld of Alderaan, and at one point in the year 3643 BBY, he was in the region known as Silvan Hills, along with Imperial forces stationed around a Thul Command Bunker. Whilst in the bunker he submerged himself fully clothed in his purple robes and armor, in a tank of kolto, a medicinal liquid.