Korriban

Korriban, known as Pesegam during the reign of Xim, and also known as Moraband by the time of the Clone Wars, 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 immense dark side power.