In the classic novel Journey to the West, the Jade Emperor mockingly appoints the Monkey King, Sun Wukong, as the “Bimawen” (also translates to “BanHorsePlague”, or “epidemic-avoiding monkey”) to oversee heavenly horses.
In Journey to the West, the tales of immortals, demons, mortals, and ghosts unfold across the three realms (Heavenly, Mortal, and Underworld), which reflects the Daoist cosmology.