A floating light or group of lights, usually much brighter or at least visually larger than fireflies or fairies (in case the latter emits light in any manner).
Alternate names: Will-o'-the-wisps, Will o' the wisps
The first video game about Will-o'-wisps was released in 1985.
* Sprites - may be indistinguishable from a distance.
Sprites/pixies occasionally may be mistaken for will-o'-wisps from distance if they share the eerie glow, especially if the game doesn't depict them as anything more descriptive than a strange glowing thing.
Note that this is NOT for will-o'-wisps that are indistinguishable from fireflies or similar things.