The Origin of Dungeons [Dungeon Core]

One day, Mana resurged on Earth. No System appeared, no Immortals descended and no portals with monsters pouring out showed up. Everything simply started evolving.
In the midst of all this, through a series of coincidences, an unfortunate soul got trapped inside a pile of minerals instead of disappearing. With no one to guide him, he will find his own path of existence, the path of a guide, a creator.

A Dungeon.

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I will also be posting this story on Royal Road, you can check it out at https://www.royalroad.com/profile/497404/fictions

Disclaimer: The cover is made with AI Art, and not by myself.