Thorn Body

Spell causes spines to grow from your exposed skin, damaging creatures that strike you. Any creature striking you with a melee weapon, an unarmed strike, or a natural weapon takes 1d6 points of piercing damage +1 point per caster level (maximum +15). Creatures using melee weapons with reach are unaffected by this spell. Creatures that successfully grapple you take 2d6 points of piercing damage +1 point per caster level (maximum +15). In addition, your natural attacks and unarmed strikes deal an additional 1d6 points of piercing damage.