Defense Upgrade

The Defense Upgrade is a power up available in multiple games, usually granted by a Great Fairy

In Ocarina of Time, the upgrade is granted by the last fairy of the game. After you obtain the Golden Gauntlets (obtained in Ganon's Castle) go outside of the castle and follow the path to the right to find the large stone. Lift the large stone and you will discover the last Great Fairy and she will give you a defense upgrade that makes all enemies' attacks do half of the damage. This upgrade is represented by a white outline around the hearts in Link's life meter.

In Majora's Mask, the upgrade is again granted by a Great Fairy. If Link collects all 15 stray fairies in the Snowhead Temple and returns them to their fountain, the Great Fairy will upgrade Link's defense. The effect of this upgrade is the exact same as in Ocarina of Time.