Would the bone crusher convert all the d bones they are holding into xp for you?
Well there goes that ideaWhen a player has a Bonecrusher present in his or her inventory, all bones dropped by monster kills, or obtained from hunting, will be automatically converted into Prayer experience
Got that from runescape wiki
BC offers a few thousand prayer xp per slayer task. I bring it for normal and big bone droppers. I usually bank the dragon bones for later use or sale.
What the fuck are you even talking about? That has nothing to do with the topic at hand that has already been resolved.

