Shield of Cthulhu

The Shield of Cthulhu is an Expert Mode accessory from Treasure Bag dropped by Eye of Cthulhu. In order to use this item, the player must double-tap either the right or left key. The character will then run super fast to the right/left (similar to the Tabi) and deal 30 damage to any enemies you come into contact with for a short time. You will also be momentarily invincible.