Form of the Dragon I

Size becomes Huge (15' space, 10' reach)

+10 size bonus to Strength
+8 size bonus to Constitution
+8 natural armor bonus
fly 120 feet (poor)
blindsense 60 feet
darkvision 120 feet
a breath weapon (12d8) every 1d4 rounds
DR 10/magic
frightful presence (DC equal to the DC for this spell)
immunity to one element (based on choice)

You also acquire the vulnerabilities, if any.

Black dragon: 60-foot line of acid, resist acid 20, swim 60 feet Blue dragon: 60-foot line of electricity, resist electricity 20, burrow 20 feet Green dragon: 30-foot cone of acid, resist acid 20, swim 40 feet Red dragon: 30-foot cone of fire, resist fire 30, vulnerability to cold White dragon: 30-foot cone of cold, resist cold 20, swim 60 feet, vulnerability to fire Brass dragon: 60-foot line of fire, resist fire 20, burrow 30 feet, vulnerability to cold Bronze dragon: 60-foot line of electricity, resist electricity 20, swim 60 feet Copper dragon: 60-foot line of acid, resist acid 20, spider climb (always active) Gold dragon: 30-foot cone of fire, resist fire 20, swim 60 feet Silver dragon: 30-foot cone of cold, resist cold 30, vulnerability to fire