The Core'S Origin

Dungeons. They are an integral part of so many stories and worlds. They can be the foundation of an economy, a place for the weak to grow strong, or a threat to the entire world.

Nearly as common as the idea of a dungeon, is the concept of a dungeon core. However, where did dungeon cores first come from? Are they just a natural occurrence? When did they start to appear?

This is the story of the first dungeon core.