The Sith Brotherhood vs. the Sith Empire.
Kun and Ulic won the war and have rebuilt their own Sith Empire and thanks to Sith Sorcery have been alive for centuries. They also have Revan and Malak along with any Jedi who in this empire our now Sith in their Empire, along with any Republic ships that where created during the Great Galactic War. Aleema and her brother are alive as well since they did not try to betray Kun, and if it helps they somehow managed to turn Nomi Sunrider to the Dark-side as well. What happens?!