Bramble Armor

At 6th level, you can cause a host of wooden thorns to burst from your skin as a free action. While bramble armor is in effect, any foe striking you with a melee weapon without reach takes 1d6 points of piercing damage + 1 point per two levels you possess in the class that gave you access to this domain. You can use this ability for a number of rounds per day equal to your level in the class that gave you access to this domain. These rounds do not need to be consecutive.