If you're into games, think games with deep dark lore Dark Souls, Elden Ring, Hollow Knight, Drakengard, Nier Automata, Myst.
Books I've already read that have scratched this itch:
- Annihilation
- Borne
- Piranesi
- The works of vermin
- Right Hand of Darkness
- Prince of Nothing Series
- Berserk
- Red Rising (kind of)
- House of Leaves (started it today)
Genre doesn't matter but bonus points if there's unfathomable elements like elder gods or weird religious stuff.
by towalktheline