The Floating Isles

Floating Islands are all you can see. If you look down all that can be seen are clouds and an endless abyss. A majority of the citizens are adventurers that belong to the the guild. Their goal, to seek the bottom of The Dungeon. The Dungeon is the large pillar in the middle of each island which meet up to a larger central pillar that goes down into the abyss. The question that is on everyone's mind is how The Dungeon got there.