Demon Wings

 are tied with Angel Wings for being the most effective flight-enabling item in the game. They produce a flapping sound when used.

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Without Rocket/Spectre Boots, wings allow for 5 flaps worth of flight time. When stacked with either pair of boots, the flight time is extended to 12 flaps if the player starts from the ground, or 8 flaps if the player starts hooked to a surface via a grappling device. You can also float down slowly by continuing to hold the jump button after the max flying distance. The Demon Wings negate all fall damage, regardless of whether or not you are floating. While wearing the Hermes Boots or Spectre Boots, you will be able to fly more quickly, and flying will also count as uninterrupted running for the purpose of reaching top speed with these boots.