Dungeon Core -

: The "Core" is usually a personified entity that can think, plan, and feel, often having been reincarnated (Isekai) from another world.

: Dungeons typically grow by harvesting energy (often called "Mana" or "Essence") from the people or creatures that die within them. Dungeon Core

: These stories often feature a unique perspective, combining godlike power within their domain with the vulnerability of being unable to move or perceive much of the outside world. Notable Books and Series : The "Core" is usually a personified entity

If you're looking to dive into the genre, these are highly-rated entry points: these are highly-rated entry points: