Shapechange

This spell functions like polymorph, except that it enables you to assume the form of any single non-unique creature (of any type) from Fine to Colossal size. The assumed form can’t have more than your caster level in Hit Dice (to a maximum of 25 HD). Unlike polymorph, this spell allows incorporeal or gaseous forms to be assumed.

You gain all extraordinary and supernatural abilities of the assumed form, but you lose your own supernatural abilities. You also gain the type of the assumed form in place of your own. The assumed form doesn’t disorient you. Parts of your body or pieces of equipment that are separated from you don’t revert to their natural forms.

You can become any creature you’re familiar with, changing form up to once each round as a free action. The change can’t take place during another action. If you use this spell to create a disguise, you gain a +10 bonus on your Disguise check.

Focus: A jade circlet worth at least 1,500 gp, which you must place on your head when casting the spell. The focus melds into your assumed form.