Dungeons are not an uncommon occurrence, if they were many towns and cities would be significantly worse off. New ones rarely become anything of note, perhaps only valuable to locals near them, but sometimes either via the challenge, the experience, or the reward, some become wide known.

  Today another dungeon is forming, inside of a rather deep cave mana has gathered at the back for months, a long gestation time for a dungeon but not unheard of. In a burst of light on the ground the cave is illuminated for but a moment, at last the dungeon has formed scaring off a few insects in the process. With a few more minutes any remaining light dies down as the core is completely filled with mana, but afterwards something much more unusual happens, the insides of the cave becoming like paper, very mana rich paper.

  "...?" The core awakens immediately aware of its dungeon, the moment it can its mana leaves its core and floats around, almost as if it's inspecting it, like a child inside of a new home, it curiously looks around at the paper for a while before it moves to the entrance of the cave, looking out at the sunlight it feels... joy, at this new sight. By mostly instinct but also led by its own innate curiosity to see more of this it forms a small, almost pencil shaped tendril of mana and begins scribbling on the top of the cave, turning it into the same hue of blue as the sky, and as the mana takes to the paper it forms a new fake sky inside the cave, the new wind blowing outside it.

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  "???" After finishing its work the core stares up at its own sky confused why there's no new light coming from it even if there was wind. It keeps scribbling more blue onto the scribbled sky in some hope it might bring more light, even eventually adding on scribbles of white that form clouds, but to no avail. After a few more minutes of trying it becomes pointlessly frustrated, instead choosing to scribble some green onto the walls and parts of the ceiling to the cave. After it's finished to any normal creature it would be... a strange sight inside the cave, as the sky would have converged with the land in a twisting but small landscape, yet to this core... it's proud of its little drawings, even if it couldn't do everything it wanted, it's happy so far.

  After it's 'successful' drawing session it chose to return to its core, feeling drained might be an understatement for it, given it created its own sky, it exhausted most of the mana that had accumulated into its core without any realization. Resting in its core it feels a sense of 'rest' as best a massive clump of mana can.

  An hour of rest later... the core felt something small entering into its dungeon.