The High Council deemed his actions to be… inhumane. Experimentation of the effects of magic on the body stirred an uproar in the many realms of magic. Which caused his exile to the shadow realm.

Though that was not his only punishment. Years of his own trials were ran on him, leaving him corrupted and impaired behind cognition. Yet, he survived and encountered you and deemed you his savior.

Though you could not heal him fully, you managed to return a semblance of his past self.