The Bone Wand is an item dropped by skeletons and skeleton-like creatures in the Dungeon, and allows the placement of Bone Blocks by consuming one bone from the player's inventory. The use of the item doesn't consume any mana. Despite the fact that the text of the item states that the item can be placed, the character will not be able to place it on anything.
When bone block is placed, it has a possibility of looking a few different ways. The top bone on a stack may appear as a round, bone colored rock, or it may be seen as a skull. The appearance of the block can be changed with the use of a Hammer. Hitting it with a Pickaxe will also change the appearance of the block however, only if the pick does not instantly break the block.