Thule

Thule was a dry and arid Force nexus steeped in the dark side of the Force that lay upon the western flanks of the Stygian Caldera in the Esstran sector. A hidden Sith fortress world for most of its history, Thule consistently served as a redoubt and resource for many generations of Sith over a protracted period of millennia.

Originally a part of Xim the Despot's empire, Thule was colonized by members of the Sith species prior to the formation of the old Sith Empire in 6900 BBY. A fortified stronghold of the early Sith, Thule eventually came to host a Sith stealth regiment drawn to the world for its power in the dark side and its remote location. The planet's isolation allowed it to survive the Empire's fall in the Great Hyperspace War, and its special forces units were subsequently joined by Sith-blooded refugees fleeing the Republic counterinvasion of the Sith Worlds at the war's end. The world became a hidden stronghold of both Exar Kun's and Revan's Sith Empires, and its residents swore themselves in service to the Sith Order in its disparate incarnations over the subsequent millennia.

Thule was unique in that its population was aware of the Sith's continued existence following the conclusion of the New Sith Wars, in which the last vestiges of the Sith were widely assumed to have been rendered extinct. Pledged in service to the surviving Banite Sith of the Order of the Sith Lords, Thule's elite soldiers frequently participated in the schemes of various Sith masters and apprentices during the Great Peace of the Republic and into the Imperial Period. Thule's status as a hidden resource world for the Sith Order's use alone, confirmed with Emperor Palpatine's deletion of Thule from both the histories and star-charts, ultimately allowed it to survive the Galactic Empire's fragmentation and persist in isolation through the conflicts and crises that followed the Battle of Endor.

Text and facts from the “Thule/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.