Polymorph, Greater (Silver Dragonkind)

You are in a dragon-like creature form now. You have a +4 size bonus to Strength, a +2 size bonus to Constitution, a +4 natural armor bonus, immunity to difficult terrain, and resistance to cold 20. Your movement speed is increased by 10 feet. You also gain one bite (1d8), two claws (1d6), two wing attacks (1d4), and a breath weapon ability. You may choose to resume your normal form as a full-round action; doing so ends the spell for you. Breath Weapon: Your breath weapon deals 6d8 points of cold damage in a 30-foot cone and allows a Reflex save for half damage. You can only use the breath weapon once per casting of this spell.