Thandruss was a planet located within the Thandruss system of the Expansion Region and the home planet of the Krytollaks. The movements of its two moons were the basis of the Krytollak calendar. During the Imperial era, the indigenous Krytollaks virtually worshiped Emperor Palpatine. Their ruler, Empress Devir, considered Palpatine her rightful lord and master. An Imperial advisor helped her rule her people, and supervised rapid technological expansion. Despite their steadfast Imperial loyalties, many Krytollaks disliked the increased taxes imposed by the Empire.