XoXaan was a humanoid female who, along with eleven other Jedi defectors, became the first Lords of the Sith. As Marchioness of the Dark Jedi’s Black Legions, XoXaan fought in the cataclysmic Hundred-Year Darkness war, but was defeated and exiled from the Jedi Order following a rout on the world of Corbos in 6900 BBY. Guilty of high treason, XoXaan was one of twelve Dark Jedi who were banished from the Galactic Republic only to discover the planet Korriban, where they found and enslaved the aboriginal Sith species. Christened as the first of the Sith Lords, XoXaan and her contemporaries instituted a religion that centered around worship and practice of the dark side of the Force, and ruled their new Sith Empire as part of the Sith Council under the Dark Lord of the Sith, Ajunta Pall.

Although other Sith Lords possessed similar talents, XoXaan was noted among her peers for her skills in dark side healing. She recorded her knowledge in a holocron, which was entombed with her in Korriban’s Valley of the Dark Lords. Her spirit waited millennia for an individual whom she felt was worthy of her Sith teachings, and it found one such student in the ex-Jedi A’Sharad Hett around 17 BBY. From XoXaan’s spirit and holocron, Hett learned the ways of the dark side and eventually assumed the mantle of Dark Lord under the moniker Darth Krayt, creating a new Sith Order. After his Sith conquered the planet Coruscant in 130 ABY, Krayt erected a massive statue within the Temple of the Sith there in reverence of XoXaan—who was considered his first and greatest Sith teacher.