Can become a vapourous cloud. As a cloud you are immune to critical hits and can neither attack nor be attacked. You may fly at a speed of 20 ft./round. A wind attack from a 10th level char. or higher hits with enough force for you to have to roll a Reflex of 15 + 1/5 levels or be forced back into normal form. You must wait 1d6+4 rounds before resuming vaporous form.