Horror Revival: The Underworld Descends Upon the Mortal Realm from the Start

Any Stories About the Underworld, with the Protagonist as Its Supreme Ruler?

Novels about the underworld.

Build the Underworld, Summon the Netherworld Officials, Command a Million Yin Soldiers

Not a bleeding heart, and actually smart.

Ghost Hunting with a System: Human or Ghost Protagonists Are Both Fine, but No Horror-World Settings

Yin Celestial and the Underworld, No Female Lead, No Goody-Two-Shoes Protagonist

Not an urban novel!

Looking for Novels About Corpse Drivers, Taoist Priests, the Underworld, the Nine Hells, Sect Leaders, and the Like

A Book of Life and Death in One Hand, a Judge’s Brush in the Other

The protagonist holds the power to judge the life and death of gods and ghosts, and to govern yin and yang.

Rebuilding Heaven or the Underworld with a System

The protagonist transmigrates to a world with neither a Heavenly Court nor an underworld. They get a System and gradually establish one of the two, eventually becoming its ruler.