Rajaat
Rajaat, alias the War-Bringer and the First Sorcerer, was a twisted pyreen and creator of both defiler and preserver magic. Practically immortal, Rajaat was born during the Green Age of Athas, and had a great loathing for the races spawned by the Rebirth (including his own). Insane and tied to elemental water, Rajaat wished to restore the Blue Age, when oceans covered the planet Athas, and wipe out all races but the halflings.
To that end, he spread the use of defiling magic, then used the combined powers of the Pristine Tower and the Dark Lens to create his 15 Champions, each intended to wipe out the other races of Athas (which they thought would ensure human domination of the planet). However, while many succeeded over hundreds of years, Borys of Ebe, the 13th Champion of Rajaat, discovered his master's true goal. Aided by his fellow Champions, Borys slew Rajaat, imprisoning his essence in the Hollow and his body within the Black Sphere. Thus Rajaat remained imprisoned for 2000 years, his prison guarded by Borys (now the Dragon) and maintained through the yearly sacrifice of 1000 slaves from each city ruled by the Champions, now transformed into sorcerer-kings.
However, after the fall of King Kalak of Tyr, Rajaat was foolishly freed by the new king of free Tyr, Tithian, using the Dark Lens. In the explosive results of his escape, the city of Ur Draxa was destroyed, and Rajaat engaged his former Champions in battle, imprisoning Andropinis in the Black and slaying Tectuktitlay. Sadira, the Sun Wizard, and Rkard, mul son of Neeva, were able to use the Dark Lens to magnify a sun-spell, dissolving Rajaat's body and banishing his essence back into the Hollow. Sadira then sealed the Dark Lens within the Ring of Fire, placing wards on it so that Rajaat might never again escape.