Brain

The Brain summons a pet Zombie when used. It grants the Pet Zombie buff that lasts until the player manually cancels it by right-clicking the buff's icon, or dies. The pet zombie can deal a small amount of damage when it touches an enemy.

It is a common drop from The Groom. It and can also rarely be obtained from Golden Chests & Shadow Chests.

Trivia

 * The animation of the zombie when you fly has the same look as the Spectre Boots animation while flying.