Hero's Charm

The Hero's Charm is a Mask in The Wind Waker that enables the player to see the life energy for enemies when equipped. It is worn on the face, and the life energy appears as a red bar next to the enemy when it is L-Targeted. It is obtained after giving Miss Marie 40 Joy Pendants.

In Boss Battles, the energy is displayed at the bottom of the screen. But Ganondorf for some reason is not.