The Flame Spider is quite similar to other types of spiders; in fact, it is actually a Platform Spider with fire as its element. Normally, it runs back and forth in a determined path and never deviates from it, unless being frozen. If so, it will be stopped in its tracks.
Flame Spiders are mostly minor nuisances, as they only block Amaterasu on her path and she will be burnt when contacts are made. However, these creatures are also a key element in puzzle-solving and advancing in Wawku Shrine. When active, they can be used as a source of fire for Inferno. When frozen with Blizzard or Icestorm, they will be stopped in their tracks for a certain amount of time. During this time, the Flame Spiders can be used as platforms (the heights and locations of these platforms are adjustable by freezing the Flame Spiders during certain moments when they are at a desired location) or a source of ice to freeze other spiders or refreeze themselves.