Bone Barbs

Your bones jut out from beneath your flesh, forming needle-like spines. You take 1d6 piercing damage.
If a creature comes into physical contact with you or performs an unarmed attack against you, they must take 1d6 piercing damage. Your unarmed attacks also do an extra 1d6 damage.
After 10 minutes the protruding bones crumble to dust.