It can be used by right-clicking it when there are mobs nearby in a radius around the player. If there are, it will damage all of the mobs in that radius and consume one use, playing a special sound and causing white particles to emanate from affected mobs. If not, the doll will not consume any uses and say a special message indicating there are no nearby mobs. It is important to note that any mobs killed with the Voodoo Doll are NOT counted as player kills, meaning they will not drop experience or any items that require the mob to be killed by the player.
The Voodoo Doll's effect will not work on Wights or boss mobs.