Irra

Irra was a male Celestial who was one of Mendax's disciples during the Demigod War.

After the war ended with the Dark Celestial's defeat, Irra was converted into the planet Korriban by the other Celestials, where he would be imprisoned forever.

Personality and Traits
Irra was often seen as paranoid and warmongering by the other Celestials, always checking over his shoulder for backstabbers and traitors. This made him very susceptible to the words of Mendax, who manipulated him into joining the Dark Celestials, ironically betraying the people he swore to defend from betrayers. Mendax claimed the others were planning to cast Irra out for being a strong warrior who could potentially have the power to overthrow Dominus, which was obviously not true. However, Irra's fear was converted into anger and wrath against the Light Celestials and he became a terror while fighting against them.

After the Demigod War and his capture by the Light Celestials, Irra was forcefully converted into a planet as punishment. She became the planet Korriban. Her personality bled into the planet and the natives of the planet, the Sith species, later evolved from her template. They would later form the Old Sith Dynasty, an order of Dark Side wielders who used fear, anger and hate as weapons, the same way that Irra did eons previously.