Morton was an Opal-Jeweled Warlord from Glacia. He is the cousin of Karla - Glacia's Queen - and member of the First Circle in Jaenelle Angelline's Dark Court. He was the first of the boyos whom Saetan SaDiablo met since he delivered the message from Karla to him.
In Queen of the Darkness Morton was killed by poison but made the transition to demon-dead. Even though his death wounds hadn't looked bad he decided to retreat from living Realms and reside in Hell. Presumably, he helped anchor the untainted Blood along with the other demon-dead when Jaenelle released her Ebony power and was burned out in the process, becoming a Whisper in the Darkness.