Moon Shell

The Moon Shell is a Hardmode accessory that can be crafted at the Tinkerer's Workshop. It has the combined effects of the Moon Charm and the Neptune's Shell. Equipping it will turn the player into a Merfolk when entering water (at any time), or into a Werewolf at night. The Merfolk form replaces the Werewolf form if entering water at night.

The buffs from the Moon Charm:
 * +2% Melee critical hit chance
 * +5.1% Melee damage
 * +5.1% Melee speed
 * +5% Movement speed
 * +3 Defense
 * Slightly increased jump height and jump speed
 * +0.5 HP regeneration per second (Like the Band of Regeneration)

The buff from the Neptune's Shell:
 * Turn into Merfolk (no air bubble limit and movement in water is the same as on land)

Trivia

 * The Moon Shell resembles a purple Neptune's Shell with a crescent moon carved into it.