Polymorph, Greater (Large Fire Elemental)

You are in large fire elemental form now. You have a +4 size bonus to your Dexterity, a +2 size bonus to your Constitution, a +4 natural armor bonus to AC, resist fire 20, and vulnerability to cold. You also have two 1d8 slam attacks and the burn ability. You are immune to critical hits and sneak attacks. Your movement speed is increased by 20 feet. You may choose to resume your normal form as a full-round action; doing so ends the spell for you. Burn: A fire elemental deals 1d8 fire damage in addition to damage dealt on a successful hit in melee. Those affected by the burn ability must also succeed at a Reflex save or catch fire, taking 1d8 damage each round for an additional 1d4 rounds. Creatures that hit a burning creature with natural weapons or unarmed attacks take fire damage as though hit by the burning creature and must make a Reflex save to avoid catching fire.