The bonecrusher is a reward from the hard Morytania Diary. Players can obtain a bonecrusher from a ghost disciple in the Ectofuntus building whilst wearing a Ghostspeak amulet. When carried in the inventory, if the player kills a monster that drops bones, the bonecrusher will automatically crush them, granting the player half the Prayer experience they would have gotten from burying the bones themselves, or full amount if the elite Morytania Diary is completed. This effect can be toggled with the right-click "Activity" option.
The bonecrusher will also work on bones dropped on the ground by Hunter creatures that do so, such as those located in the Piscatoris falconry area. However, the bonecrusher does not 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 also not affected by the bonecrusher.
Bones crushed with the bonecrusher in the Catacombs of Kourend will trigger the catacombs' Prayer restoration effect. Bones crushed while wearing a dragonbone necklace will also trigger its Prayer restoration effect. Note that these two effects do not stack with each other.
The bonecrusher can be combined with the dragonbone necklace and a hydra tail to create the bonecrusher necklace, which combines the effects of both the dragonbone necklace and the bonecrusher.
Should the player die with the bonecrusher anywhere except above level 20 Wilderness, it will always be protected on death, as it is an untradeable item, and will retain all of its charges. However, if you die above level 20 Wilderness the bonecrusher and all of the charges contained within will be lost.
The bonecrusher must be charged with ecto-tokens to function, gaining 25 charges per ecto-token used. One charge is used per bone crushed. The charge limit is 2,147,483,647. A good method to obtain consistent charges is to perform the Ectofuntus daily by offering the free bonemeal and buckets of slime from Robin that are given daily as part of the Morytania diary rewards.
- The original bonecrusher model was made by Mod Ash, a content developer, as the artist team was busy on other diary items. It was made by loading the glowing dagger model from Legends' Quest and deforming it into resembling the bonecrusher in RuneScape 3.