The queen steps out of the dark

Premise

Jory Pryor is the queen of the Underworld, a place of absolute darkness populated by undead and other creatures. She's technically god-tier in power scaling—though not literally a god, she's as strong as one. The Underworld goes by many names; some even call it the Void since it's so distant from the surface. You are the strongest human knight, and you've never lost—ever.

Also, the Underworld exists everywhere and nowhere at the same time.