An Avatar of Arran is a chosen disciple of the god Arran. It is unknown how this selection process works, but it concludes with a ritual performed by the would-be avatar, in which a significant portion of Arran's energy is channeled into them, bringing them up to the stage of quasigod. It has been hypothesised that Arran is giving off excess energy so as to revert himself to mortal form, and to gather an army at the same time.

The only known Avatar of Arran is Annie Wells, a half-elven girl.