Fairy (Magic)

The magic is an ability in.

Overview
The Fairy magic is a unique ability that temporarily turns Link into a Fairy. While Link can't attack enemies in his fairy form and leaves him defenseless to enemy attacks, he'll have some great advantages in it. The ability to fly will help Link get into high places and cross dangerous pits of water or lava, and the small size of a fairy will enable him to get through small holes. When he activates the magic in a palace, he can fly through the keyholes of locked doors.
 * If Link is carrying any key during the process, the key will be used first.

In order to obtain this magic, Link must find the Water of Life in a swamp cave to the west of Midoro Palace and bring it to an Old Woman in the Harbor Town of Mido. It is required to enter the Island Palace.