The Sith Sanctum served as the central base of operations for the Sith, situated on the planet Dromund Kaas. Within the Sith Sanctum, notable areas included Darth Thanaton's private library and his personal meditation chamber.
Dating back to the construction of the Imperial Citadel, the Sith Sanctum has a long history. The Sith Emperor established his residence within the Sanctum, restricting access to his personal quarters to only a select few Sith.