Polymorph, Greater (Large Air Elemental)

The target creature becomes a large air elemental. It gains a +2 size bonus to its Strength, +4 size bonus to its Dexterity, a +4 form natural armor bonus to AC, resist electricity 20, and vulnerability to acid. It also gains two 1d8 slam attacks and the whirlwind ability. It is immune to critical hits and sneak attacks while in elemental form. Its movement speed is increased by 30 feet. The subject may choose to resume its normal form as a full-round action; doing so ends the spell for that subject. Whirlwind: An air elemental can transform into a whirlwind and back again. A whirlwind is 5 feet wide, and every creature that spends a round in the whirlwind must succeed at a Reflex save or take 1d8 bludgeoning damage. While in whirlwind form, it cannot attack but it is able to use its abilities.