Vapora

Vapora is a cloud-like monster from that can only be found in the Shrine of Air. When it is found, a Barrier appears, forcing Zelda to beat it in order to proceed. Vapora's only attack method is to move around the room and shoot small clouds at Zelda to hurt her. Once it's defeated, it leaves the Rug, and the Barrier disappears, allowing Zelda to continue.