The light that shines down on the Altar of Three, the White Light is the counterpart of the evil Black Light. By reading the inscription etched into the Altar of Three one can convert to one of the three gods of the Jenn-Kellon, Mol-Rehan, and Freedom kingdoms; Magranon, Fo, or Vynora.
The White Light is found on the Chaos and Elevation servers, and is visible as an immense beam of pure white light that shines down from the gods. Upon reaching the White Light, the enormous Altar of Three will be present.
See The Altar of Three for more details.