Enclosing Spines

As per Enclosing Shell, but instead of armor the beast excites the surface of its flesh to extend spines, barbs, thorns, stiffened hairs, or similar that inflict grievous injury upon their opponents. By giving up an Active Action and remaining motionless, the beast inflicts 2 point of Penetrating damage on anyone who attempts to attack them, whether that attack inflicts Harm or fails.