You call on the Water kami to make your face become that of another person. This is not an illusion but an actual change to the flesh and bone, re-molding your face to match that of the other person. This is a painful experience and it takes several minutes for the kami to complete the re-shaping. Normally, casting this spell requires you to be familiar with the face of the target (you must have studied it for at least 8 hours), although with enough Raises you can take on a face you have seen only once.
Your face looks exactly like the target’s face, to the point where even close friends and family members will believe you are the target. However, this spell only affects the face, not the rest of the body or the hair. Scars, birthmarks, and other identifying features elsewhere on the body must be replicated or hidden if the deception is to succeed. Also, this spell does not change your voice.