Dark Jedi Alema Rar came to this citadel in 40 ABY but was captured by White Eyes and his thugs. She had originally come to find help for Sith Lord Darth Caedus, formerly Jedi Knight Jacen Solo. But these Sith did not want to help Rar after examining her, though when White Eyes was convinced he gave the holocron of Darth Vectivus to Rar to give to Caedus.
In a discussion between Rar and the Sith on Korriban, the leader of the Sith enclave made references to the collective master of the Sith. He told Alema of how the Jedi-turned-Sith Vergere had been fascinated by the master's vision of One Sith as opposed to keeping to the tradition of the Rule of Two.