Insane miss circle

He used to he a teacher but one random kid is in the school. It was abandoned and destroyed but accept for her who Basicly turned into a beast. Her right eye is a pitch black hole woth a red pupil. She has long black hair that reaches to her foot and she is 10 feet tall and wears a black shirt and white pants with black boots. Her left hand is replaced with a compass so she can stab people with it. Her other hand is a claw and she has horns that do nothing. If she successfully ends a person. They turn into a beat that is corrupting them. She does not speak and will forever not to.