The Bonecrusher is a reward from the hard task set of the Morytania Diary. Players can obtain a Bonecrusher from the Ghost disciple in the Ectofuntus building. When carried in the inventory, it will automatically crush bones upon killing a monster. However, players only receive half the Prayer experience with the completion of the Hard tasks. In order to obtain full experience per bones, players must complete the Morytania elite tasks.
A common use for the bonecrusher is when using prayer in the Catacombs of Kourend, as burying bones inside the catacombs restores a number of prayer points. Bones automatically crushed by the bonecrusher also have this regenerative effect.
The bonecrusher can be recharged using ecto-tokens, giving 25 charges per token. The charge limit is 2,147,483,647. It is highly recommended that players do not store too many charges as all charges are lost if the player dies or if the item is destroyed. The bonecrusher uses one charge for every bone crushed automatically upon kill.
The bonecrusher also does not auto-crush bones obtained as a secondary drop. This includes drops such as long and curved bones, as well as extra bone drops from monsters such as bloodvelds. Bones dropped as notes are not affected by the bonecrusher.
A good method to obtain constant charges is to perform the Ectofuntus daily by offering 13, 26 or 39 bones having the medium, hard and elite morytania diary completed respectively, after exchanging them into bonemeal and bucket of slime from Robin.
The item needs only to be present in the player's inventory for it to take effect, and may be found useful if players have a tendency to leave bones on the ground and not bury them. When a monster is killed with a bonecrusher in the player's inventory, Prayer experience is rewarded in a way similar to Slayer experience (with bones missing from the drops), with no animation or anything similar occurring. This means that this item won't slow players down at all compared to leaving bones on the ground. The bonecrusher has no effect on drops when it is left in the bank.