The True Sith were a group of beings who were truly Sithy, obviously, and very very mysterious. They were, in fact, so true and mysterious, that no one ever saw them, not ever. Not even Revan or the Jedi Exile, or even Darth Krayt.
- Star Wars: Knights of the Old Republic II: The Sith Lords (mentioned only)
- Star Wars: Knights of the Old Republic III (sadly, no)