Kotor 2
THIS IS STARTED IN A DIFFERENT FORUM Called Theory on Nihilus' True Identity
And on a side note: I agree with Nactos that the sith are still alive, and that Revan is there battling them, and the exile has gone to battle them with him.......I wonder what happened to mira, Bao-Durr's remote, and Goto's droid.... oh sorry just thinking. I may go into detail on Revan, and the exile battling the sith later.
I believe that When Revan went to the unknown Regions that he discovered what is left of the True Sith. Now KOTOR 2 ends 2 different ways, but both are focoused on a Golden Nebula, or Star System. The good ending has The Exile fly into that nebula, and the Evil ending has him staying on Malachor V. Nactos and I both believe that KOTOR 3 will send you to that area, but I came up with the idea that The Exile may or may not be there (Depending on how you end knights 2).