The Minish Cap
Blue Wisps swiftly glides through areas in erratic, random patterns. They do not cause Link any damage, but instead curse him so that he is unable to use any of his items for a short while. When Link is hit by a Blue Wisp, it disappears and its flames surround Link for as long as the curse lasts. They cannot be attacked directly but can be sucked up into the Gust Jar, or defeated by shooting Arrows at them. Throwing the Boomerang at them will make them disappear, and as such, they will reappear once Link leaves and enters the area again.
- Encyclopedia (Dark Horse Books), pg. 212 (FS | TMC)