Monarch Wings

 Wings of ethereal matter that shimmer in the darkness. Allow one to jump again in mid-air. 

Function
Press A while in the air to flap the wings.

Use these ethereal wings to sail above enemies and discover new paths.

Allows the player to double jump.

How to Acquire
Located in the Ancient Basin, just after the Broken Vessel boss fight.

Trivia
In the game files, this ability is referred to as "Emperor's Wings"