Nathaniel

     Nathaniel is a patient at Bethlem Royal Hospital. He thinks he is under the control of a demon named Abaddon. From his point of view, he corrupts the souls of individuals using fear, allowing Abaddon to feed off of them. He cold reads Doyle telling him that his biggest fear is being condemned to the same manner as himself.
In Doyle’s dream, Nathaniel ends up breaking his own neck after telling Doyle that Abaddon controls the doctor as well.