Is black and white impermanence a fairy or a ghost?

Black and white impermanence also belongs to immortals.

Fan's helplessness is black impermanence, and Xie Bi 'an is white impermanence. They belong to Yan and are one of the eight generals under Yan. Therefore, Bai impermanence is honored as the "seven lords" and Black impermanence as the "eight lords". The first six are civil and military judges, ox head and horse face, cangue master and lock master. These eight generals caught the outlaws, and each carried out his duties, keeping all the work of the underworld running.