Defensive Quills

Sharp quills grow from your skin. You gain a +1 bonus to AC for the duration.

If a creature hits you with a natural weapon, an unarmed strike, or a melee attack, it takes 2d8 piercing damage from your quills. A creature that grapples you takes damage from the quills at the beginning of each of its turns in which it is grappling your. If a creature swallows you, it takes damage from the quills each round at the start of your turn.

You can end the spell early by using a free action to dismiss it.