You can spend 8 hours performing an occult surgical procedure upon a willing creature, permanently transforming its appearance. You decide what the creature looks like, including facial features, the sound of its voice, hair length, coloration, and distinguishing characteristics, if any. You can make the creature appear as a member of another race, though none of its statistics change. You can't alter the size of a creature, and its basic shape stays the same. The resulting transformation is non-magical, however, a greater restoration spell or similar magic cast upon the creature can restore it to its original appearance.