Frozen Turtle Shell

The Frozen Turtle Shell is a Hardmode, post-Plantera accessory that has a chance of being dropped by the Ice Tortoise, an enemy found in the Ice biome. It grants the Ice Barrier buff when equipped, with the effects varying between versions:
 * Gives 25% damage reduction as long as their health remains at or below 50%.
 * Gives the player 30 defense when below 25% health.

While not normally visible, it displays as a small blue circle spinning around the character that emits light when active.

Tips

 * This accessory works well with the Shrimpy Truffle, which gives the player a damage and speed boost when at or below 50% life.
 * The Frozen Turtle Shell is useful for fighting bosses and events, which usually expose the player to constant damage, thus activating the accessory more often than during regular gameplay.
 * Turning on autopause and swapping to this accessory when below 50% life may be advisable.

Trivia

 * Despite it being a Turtle Shell, it is dropped by the Ice Tortoise.
 * The buff can be canceled, although it will immediately activate again.