Dark Celestials

The Dark Celestials were a splinter group of the Celestials that originated after the Second Great Cataclysm during the Pre-Boshru Era

The Celestial demigod Mendax requested that the other Celestials use their powers to prevent the catastrophe. However the others refused and allowed the supernova to take place. In turn, many Celestials were killed including Mendax's mother Dolorem. This enraged Mendax, causing him to split with the group and bring many other Celestials who were disenfranchised with the leadership under Dominus, the God of Gods.

The Dark Celestials waged war against the Light Celestials but were defeated when Mendax and his leadership were captured by Dominus and his sons Praesidio and Audax. As punishment they were transformed into planets to be forever imprisoned. Mendax was given the worst punishment as he was transformed into the lava world of Mustafar, to burn for all eternity.