Ignis Fatuus

A spirit that emanates a light-green glow while floating through the air. In general, how spirits come about is shrouded in mystery, but for the ignis fatuus, there is a theory that they came from a gigantic ignis fatuus discovered deep within a forest, which is believed to be the mother of all the ignis fatuus. That certain ignis fatuus escaped capture, but there is no doubt that its discovery has accelerated ongoing research over the mysteries of spirits.