The Paths Of The Souls
After death souls are given a choice: to be reincarnated on earth again as human or to be reincarnated into heaven as angels. In order to be incarnated, however, one must undergo countless trials and tribulation in purgatory.
Unlike the archangels, whom God personally created, Azraels are angels that human souls have reincarnated into. Within heaven, after reincarnation, you will receive jobs to attend to throughout the underworld.