Ivress was a Sith Lord of the re-established Sith Empire during the era of the Galactic War, who was a male Human. As a member of the Order of Revan, he rose to the position of commander, overseeing former Imperial Revanite troops stationed at Sky Ridge Island on Rishi. His subordinates included Colonel Raygus Mol, Lieutenant Balko, and Sergeant Tarsten. A point of contention existed between Ivress and Captain Milenec, the leader of the former-Republic Revanite forces, as Ivress questioned Milenec's true dedication to the ideals of Revan, even though they fought for the same objectives.
Depending on the light or dark side choices made by both the Republic and Imperial factions, Ivress's ultimate destiny changes. For Imperial characters, there is the option to deceive Ivress, leading him to imprison Milenec and his followers for alleged acts of treachery, or to simply eliminate him. Conversely, Republic players have the options of either killing him directly or having Milenec and his soldiers capture him.