you get the bone shaker about half way after you beat the game. (for me that is. it might be different for you.)
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You can get bone dusts by fighting skeletons. The ones that are known to drop it are the ones that were around Swordhaven when it was under attack. Also, the ones at bridge (/join bridge) will also drop bone dusts.
Dark Pulse Quick Attack Bone Rush Aura Sphere Metal Claw Swords Dance Me First Extremespeed Dragon Pulse and MANY MANY MORE!
You can't you can only craft bones to bone meal, unfortunately not the other way round :/ Sorry
fight
jaw bone jaw muscle