The Lost Tribe of Sith was a marginal Sith Order that formed on the remote planetKesh. It was founded in 5000 BBY after the warshipOmen, carrying members of Sith LordNaga Sadow‘s Sith Empire, was ambushed, knocked off-course, and forced to crash-land on the world. The Tribe quickly dominated the native Keshirispecies, who believed the newcomers to be their gods. SithCaptainYaru Korsin became Grand Lord of the Tribe and of the Keshiri, a title that was passed on to his daughter, Nida, after his death. Isolated from the outer galaxy for years, the Sith built a Temple in the Takara Mountains over the Omen‘s crash site and moved their headquarters to the capitalcityTahv. Although the original Tribe consisted of several members of both the Human and Sith species, Yaru Korsin ordered a purge of all members of the latter in 4985 BBY. Over time, the Sith formed a ruling Circle of Lords, made up of Lords and High Lords, and ruled by the Grand Lord. Although one Jedi Knight, Jelph Marrian, discovered the Sith in 3963 BBY, the destruction of his strikefighter permanently stranded him on the world as well.
The Sith remained isolated for millennia, but after the end of the Second Galactic Civil War in 41 ABY, the Sith Meditation SphereShip found the Tribe. Ship informed the Tribe of the Jedi’snewfound dominance in the galaxy and of the recent destruction of the last remnants of the Sith. Ship assisted the Tribe in traveling offworld and forming a new armada, and two years later, the Tribe felt the presence of Jedi Grand MasterLuke Skywalker in the Force and determined to kill him. However, Ship was suddenly overcome by the will of Abeloth, a dark side entity living in the Maw, and deserted Kesh for Abeloth’s world. The Sith quickly launched a strike team to recover Ship and assassinate Skywalker. The team encountered Abeloth in the Maw, and she weakened the strike team before allowing Ship to return to them so that they could continue on their mission. Their attack on the Jedi failed, however, and Skywalker and his son Ben tracked Vestara Khai, the team’s sole surviving member, to the planet Dathomir. There, a team led by Viun Gaalancaptured a group of the darksiderNightsisters and dueled with the Skywalkers while attempting to retrieve Khai, although again the Sith were defeated.