Vial of Blood

The Vial of Blood summons a pet Bat when used. It grants the player the Pet Bat buff that lasts until the player manually cancels the buff or dies. Unlike other pets, the pet bat will deal a small amount of damage to enemies it happens to touch. Also, when a player is in a body of water, the bat will fly above it like any other type of bat. When the pet bat gets too far from the player, it can fly back instead of shooting back with clouds behind it.

It is an uncommon drop from Vampire Miners. It can also rarely be obtained from Golden Chests.