A place of myth and mystery, the Below is spoken of by few with any real consideration, and fewer with any true belief. After all, a realm filled with magic and monstrosities beyond imagining would be ridiculous, especially existing beneath one's very feet. Someone would have found it by now, through science, even if rumor dictated that it was able to "choose" who entered it. More wishful magic nonsense.

...Right? 

Note: This is a story on dungeon exploration, not a dungeon core/sentient dungeon!