In epic fantasy literature, this is a mortal, humanoid-type who carry a celestial spark from the Higher Planes within their souls. You can stoke that spark to bring light, soothe wounds, and unleash the fury of the heavens. Normally this divine spark appears because the heritage of the Aasimar can be hidden for generations, only to suddenly reveal itself in the child of seemingly human parents. His appearance is human, but with angelic features.
