Studio Arcanis

does anyone know anything about recovering the ti bon ange, and how to keep it from being stolen in the first place? a black magician better known as boko removed one from someone and mentioned that it would not be returned, sadly to say this person was asleep when this all occured, this is when the theft took place, the person who's soul has been taken suffers from nightmares, voices, confusion, vision, among other thing associated with black magic, left and right hand magic has been used these, the person does not abuse drugs, or alcohol. : any helpful suggestions will be helpfu.