Pixie

The Pixie is a flying monster found quite commonly in the Hallow biome (above ground). They are the only source of Pixie Dust in the game. They are affected by knockback and can deal damage when touched by the player. The Pixie emits light, which make them very easy to see at night and day.

Trivia

 * The pixie may be an allusion to fairies, entities from the Legend of Zelda series. Most notable is the character Navi. They are also similar to Lums, from the Rayman series.
 * The sound the pixie makes when struck is similar to that of the Heart Crystal when used.