FIY, If You Can

FIY Hospital is a special kind of hospital, the kind that houses "unique" patients, to the point that if you imagine a disease, it probably exists there.
One day, FIY receives a new patient, who stirred up quite the commotion. He appears perfectly ordinary; however, on a whim, he can terrify the boldest hearts, his screams shake your very soul, and his strength eerily doubles.
Because of him, what has been hell in FIY became despaired inferno; unfortunately, none has survived his phases. Some say he was chosen to end their misery, but some say he has anger management issues.