Will-O-The-Wisp

Will-O-The-Wisp - A magical being conjured up by Macbeth to spy upon King Arthur and the gargoyles during the quest for Excalibur. The will-o-the-wisp took on the form of a small ball of light, and conveyed back to Macbeth whatever it saw, including Arthur’s conversation with the Lady of the Lake over the whereabouts of Excalibur.

Real World Background

Will-o-the-wisps are an element of British folklore, a sort of magical interpretation of the eerie lights found in marshes and caused by marsh gas. Other terms for the will-o-the-wisp include "ignis fatuus" (foolish fire), "corpse candle", and "Jack-o-lantern". These lights were believed to be spirits who would lead humans into quagmires and other treacherous parts of the marshes, and leave them there. The exact origin of will-o-the-wisps vary from legend to legend. Some make them the souls of infants who died unbaptized, while others portray them as the ghosts of people who were too sinful for Heaven, but who for one reason or another were unwelcome in Hell, and therefore were condemned to roam the earth forever, exiled from both places.