Will o the wisp
Ignis Fatuus (will-o'-the-wisp) Folk belief attributes the phenomenon to fairies or elemental spirits, explicitly in the term "hobby lanterns" found in the 19th century Denham Tracts. Briggs' A Dictionary of Fairies provides an extensive list of other names for the same phenomenon, though the place where they are observed (graveyard, bogs, etc.) influences the naming considerably. When observed on graveyards, they are known as "ghost candles", also a term from the Denham Tracts.
Will-o-the-Wisp Scary Tale or Fairy Tale? A Will-o-the-Wisp in western folklore is a small glowing creature that appears at night to travelers, often near swamps or marshes. In these stories, this sprite lures these unknowing wanderers into the deep marsh to be lost. Once the individual is far enough away from safety, the glow disappears and the person is never heard from again. However… this will-o-the-wisp is benevolent. If you’re lucky, you may just find your way out of the swamp.
The Will-o'-the-Wisp is a strange and inexplicable luminosity that often appears in or near wet or boggy ground. As such, they are also often known as Marsh Lights. According to British Folklore they are 'Faerie fires' lit by mischievous and sometimes malevolent spirit-creatures and will try to lead unwary travelers to their doom.