Sith exodus

During the Galactic Republic's counterinvasion of the Sith Empire in the aftermath of the Great Hyperspace War, a number of Sith fled the Sith Worlds in a mass exodus led by the Sith Lord Vitiate. The exodus allowed for the survival of the Sith species and the birth of a new Sith Empire. However, Vitiate had in fact known the location of Dromund Kaas, a lost colony of the old Empire, the entire time, and the true purpose of the twenty-year exodus was to build his people's devotion to him and make them dependent upon his wisdom and guidance.