As polymorph other, except this spell enables the character to assume the form of any single creature of less than deity status (including unique dragon types, or the like) or any single object. The assumed form can be no smaller than a flea and no larger than 200 feet in its largest dimension. Unlike polymorph other, this spell allows incorporeal forms to be assumed.

The character's new form works like a polymorph other form. The character still does not gain the supernatural or spell-like abilities of the character's new form, though the character does gain its extraordinary abilities while keeping the character's own. The character also gains the type of the new form (for example, "dragon" or "magical beast") in place of the character's own. The new form does not disorient the character. Parts of the character's body or pieces of equipment that are separated from the character do not revert to their original forms. Thus, a new form’s poison bite is effective.

The character can become just about anything the character is familiar with. The character can change form once each round as a free action. The change takes place either immediately before the character's regular action or immediately after it, but not during the action.

If the character uses this spell to create a disguise, the character gets +10 on the character's Disguise check.