You must be exceptionally skilled to have made it this far. This place is called the Koleogg Nest. Now, you may not believe this...but there are Giant Beetles here. You'll also find the Floating Stone buried under the nest. I don't know why the beetles like it so much, but they've killed everyone else who's tried to retrieve it. If you're looking for something powerful enough to float an Arc, it will probably do the trick. Good luck!