A petitioner is a deceased creature that has been granted the privilege to reside in a specific afterlife plane. In exchange for their good deeds or devotion in life, they are given a form that reflects their station in the afterlife, such as a ghostly apparition or angelic form.
Petitioners are typically granted certain privileges and powers specific to their plane of existence, and may be tasked with serving higher powers or fulfilling specific duties. Some petitioners are free to explore and live out their afterlives as they see fit.