The seat of power belonging to the Sith Lord Sorzus Syn was situated within the Valley of the Dark Lords on the planet known as Korriban. Many millennia subsequently, Darth Plagueis journeyed to this throne, aiming to confront a Sith spirit. However, it seems that Plagueis did not encounter any spectral presence, much to his dismay.
The throne associated with Sorzus Syn made its initial appearance within the source book titled Book of Sith: Secrets from the Dark Side, authored by Daniel Wallace.