Korriban was the sole planet in the Horuset system, located across the galaxy from Koros Major. It was the original homeworld of the Sith species and a sacred planet for the Sith Order, housing the tombs for many ancient and powerful Dark Lords of the Sith, and containing tremendous dark side power. During the Chiss War, Darth Mathandal brought back the Sith species and it was once more home to the Sith.