Fierce Deity Link

When Link had found all 23 masks in The Legend of Zelda: Majora's Mask, and given them to the strange children inside the moon, he recieved the Fierce Deity's Mask. This transforms Link into a dark form of himself during Boss battles. Also known as Oni Link. Although very similar to Adult Link(except very deformed), the Fierce Deity is unable to use all weapons except the Fierce Deity Blade, and when Z-Targeting can fire disks of energy from his sword. Each use will consume some of your magic meter. Oh yeah, and he was the leader of a famous tribe.