Anti-Fairy

Anti-Fairies, also known as Whisps and Wisps, are recurring enemies in the Legend of Zelda series. Depicted as floating skulls, Anti-Fairies are the polar opposites of Fairies in terms of healing properties; Anti-Fairies sap a victim's health while fairies heal them.

The Legend of Zelda: A Link to the Past
Anti-Fairies appear as skulls protected by a rotating magical field. They usually stick to walls and move alongside them, though some exhibit the ability to move freely about a room, bouncing off of walls. If Link is hit by an Anti-Fairy, he suffers a loss of both health and magic power. If sprinkled with Magic Powder, Anti-Fairies turn into fairies.

The Legend of Zelda: Link's Awakening
Anti-Fairies appear in several dungeons, in which they are invulnerable to almost all weapons. The Boomerang, however, can kill them in one hit.

The Legend of Zelda: Oracle of Ages & ''Oracle of Seasons
Anti-Fairies look and act identical to their Link's Awakening counterpart. They move around diagonally across rooms and ricochet off the edge of the room and blocks.

The Legend of Zelda: Four Swords Adventures
Anti-Fairies are seen periodically throughout the game. Unlike most enemies, they can exist in the Dark World. If they touch Link, they deal a small amount of damage.

The Legend of Zelda: The Minish Cap
There are two varieties of Anti-Fairies: red and blue. Both types cause Link to be unable to use his sword or items for a period of time. Red Anti-Fairies move slowly and stay attached to Link only for a short time, however, they then reappear in the same spot where they first spawned. Blue Anti-Fairies move much quicker then red ones do, however, they do not continue to reappear after attaching to Link. Both kinds can only be defeated by use of the Boomerang, Bow or Gust Jar. If they are hit by the Boomerang or Magical Boomerang they will turn into fairies.