Bonecrusher

The Bonecrusher is a reward from the Dungeoneering skill. It requires 21 Dungeoneering and 21 Prayer. It costs 34,000 tokens at the rewards trader and is for members only.

Uses
When a player has a Bonecrusher present in his or her inventory, all bones dropped by monster kills will be automatically converted into Prayer experience. The item needs only to be kept in your inventory for it to take effect and may be found useful if you have a tendency to leave bones on the ground and not bury them. If you have a Bonecrusher in the bank, but not in your inventory, the bones will appear on the ground as usual. 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 you down at all compared to leaving bones on the ground.

If a monster drops more than one bone, such as bloodvelds or jogres often do, only the bones that are dropped as remains will be buried. The rest will appear on the ground as usual, as they are a separate drop.

Also note: the Bonecrusher (though not tradeable) holds very low value, and it is very likely to be of those items lost upon death. There is no way to replace a lost Dungeoneering reward except to earn more tokens and purchase a new reward. It is recommended that such items as the Bonecrusher be used only when a player can be certain his/her character will not die or unless the bonecrusher is not a risked item.

Previously, the Bonecrusher would not bury bones from hunting. This was fixed with an update on 27 May 2010.

Trivia

 * Before the 21 April update, the price of the Bonecrusher was 110,000 tokens.
 * A glitch can occur if an action is performed whilst a monster is in its dying animation where the monsters bones will drop onto the floor, an example is using the dragon claws special attack whilst another monster is about to die.
 * Although it requires level 21 Dungeoneering to use, it is impossible to obtain a Bonecrusher at this level. The first level you can achieve the bonecrusher is level 62, because this is when 340,000 experience is achieved (34,000 tokens).