Jaciel Morgen, also known as The Greater Nocturnal,[source?] is a Daedra encountered in the Shade Perilous. Hidden behind the Night Portal and driven into the Dreamsleeve, Jaciel is now stuck in a never ending and immobilizing grief after Dagon's troops stopped the flow of Nocturnal's magica.
In order to wake her, Deyanira, the Lesser Nocturnal, must be banished. In doing so, the Apprentice manages to move Jaciel from utter despair to rage, though only for a short while. As she realizes the "why" of the matter, Morgen agrees to aid them.