Polymorph (Small Fire Elemental)

You are in small fire elemental form. You have a +2 size bonus to your Dexterity, a +2 natural armor bonus, resist fire 20, and vulnerability to cold. Your movement speed is increased by 20 feet. You also have one 1d4 slam attack and the burn ability. 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 1d4 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 1d4 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.