From Arcanet
This spell causes the target to become unable to speak. Considered overkill by students, and a must-have by teachers, its effects can be surprisingly traumatizing. Rather than simply prevent the use of one's vocal chords the Mute spell physically draws one's lips together with steadily increasing force until they touch. Once touching a prickling sensation is felt as the flesh fuses from the back of one's jaws and forwards until the mouth is completely removed and the subject is unable to speak.