The Sith Order was a sect of Force-sensitives who utilized the dark side of the Force. The term "Sith" originally referred to a species of aliens native to the planets Korriban and Ziost, who were later enslaved and ruled by exiled Dark Jedi from the Galactic Republic. These Dark Jedi had once been members of the Jedi Order, a monastic Force religion dedicated to peace through the use of the light side of the Force. The Dark Jedi, who refused to rely exclusively on the light side, challenged the Jedi by giving in to the dark side, which started the Hundred-Year Darkness. However, they had been defeated and subsequently exiled from known space, which led to their discovery of the Sith species. Following centuries of interbreeding and mixing of cultures between the aliens and the exiles, the Sith would no longer be identified by their race, but by their dedication to the ancient Sith philosophy. This religious order would survive in many different incarnations throughout multiversial history.