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 their inventory, bones which are dropped by monster kills will be automatically converted into prayer exp, 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, as the exp does add up over time. If you have a Bonecrusher in the bank, but not in your inventory, the bones will appear on the ground as usual. It should be mentioned that when a monster is killed with a Bonecrusher, prayer xp is rewarded in a way similar to slayer xp (with bones missing from the drops), with no animation or anything similar occurring, meaning that this item won't slow you down at all compared to leaving bones in the ground.

Trivia
Before April 21st, the price of the Bonecrusher was 110k tokens.