A short lived, cold dwelling insect about the size of a black fly. Notable features include living in swarms of five hundred or more and their bio-luminescence, which is used to attract mates.
The fly emerges from the ground during a thaw and immediately seek out food and a mate.
Because the air and the ground are of significantly different temperature during these thaws, there is generally a fog. With the luminescence of the flies and the fog, it appears that small balls of light a "magically" floating through the forest they resemble a will o'wisp. Due to this resemblance, they have the nickname "whispy".
The swarm fly is found in northern Paorr, Manenlande, and Titania.