This spell wreathes you in yellow or green acidic mist and causes damage to each creature that attacks you in melee. The flames also protect you from acid-based attacks.

Any creature striking you with its body or a handheld weapon deals normal damage, but at the same time the attacker takes 1d6 points of damage + 1 point per caster level (maximum +15). This damage is acid damage. Creatures wielding melee weapons with reach are not subject to this damage if they attack you.

You take only half-damage from acid-based attacks.