Qordis

Very little is known of Lord Qordis, he was a member of the Brotherhood of Darkness, a faction of powerful Sith lords, and one of the last great Sith. Qordis trained the famed Darth Bane, the Sith who started the tradition of only two Sith existing at a time; a master and an apprentice. Bane's master fought in the Battle of Ruusan, the last great battle between the Sith and Jedi and died in the blast of the thought bomb, though his apprentice escaped. Qordis' spirit was later able to contact Bane on the Dxun, the Onderon moon after causing his ship to crash there due to envy of Bane's survival.