Neptune's Shell

The Neptune's Shell is an Accessory which requires a Mythril Anvil to craft.

When worn by players, entering water transforms them into Merfolk. While in this form, they cannot drown and are not slowed by water. They can also press your jump key (default space)to swim upward, and sink automatically. However, if under a Water Walking effect, players will have to hold the down key (default 's') to descend. Equipping the shell and wearing the Fish Bowl in the equipment slot while out of water will not turn the player into a Merfolk. Also note that it only works in water, so if the player uses an Obsidian Skin Potion to enter lava, they will be in danger of drowning and unable to swim.