A Turtle Shell is a type of helmet armor.
When equipped, a turtle shell will grant a player 2 armor points and Water Breathing for 10 seconds, which resets each time the player comes up for air.
Turtle shells can also be used to brew a Potion of the Turtle Master. This potion will grant the player Resistance IV and Slowness IV, thus making it the first ever potion to apply mixed status effects, as well as the first craftable potion to grant resistance.
To craft a turtle shell, the player will need to collect 5 Scutes.