Thearth. A sand planet with little to offer. Only the great crawler cities provide any form of permanency other than the great desert. Continuously roaming the sands in search of clouds, the only source of water, and quite possibly the next great Vortex. A being/machine/creature or something else entirely that forms a massive floating island and provides the other essential resource necessary for life, Aserite. It is used to power everything and anything. People cannot just take it as they will. They must fight the Vortex's guardians to claim the almost magical resource. 

This is a dungeon core storm story that I am working on in my free time. Please feel free to leave constructive criticism as I want to grow as an author.