Old Man Voodoo Doll

The Old Man Voodoo Doll is a summoning item for the boss Skeletron. It has a 1/2 (50%) chance to drop instead of the Clothier voodoo doll, which is also used to summon Skeletron. But unlike the clothier voodoo doll, it doesn't require you to kill the clothier and instead lets you summon Skeletron at any time during the night.