Anti-Fairy
The Anti-Fairy is, as its name implies, the exact opposite of a healing fairy. It saps a victims physical health, and in some cases their magical energy too. First seen in A Link to the Past, they are skulls ringed by red flames, and are often confused with the Bubble. In his quests, Link found out he could use Magic Powder to turn the spectre into a fairy, healing him in the process, proving that an Anti-Fairy is just a fairy corrupted by some sort of dark magic.