the Cities of the Breeze Adventures in an endless sky

Leave the material plane. Travel out through the echo realms of the faywyld and the shadowfell, beyond the transitive Ethereal plane and you will reach the Inner planes and the Elemental Chaos. Suspended in this chaos are the Elemental planes of Air, Fire, Water and Earth, the primordial forces that compose the prime material plane.

If you continued to travel into the Elemental plane of Air you may, eventually, find yourself in a demiplane known to all who live there as the The Breeze.
The Breeze is a place of endless sky. This wide blue yonder, stretching out forever, is filled with clouds giving it the appearance of being trapped inside a child's glass marble. Yet, as wondrous as this place may seem it contains greater wonders still. Wonders such as the Aurora Lightning, caused by the Elemental Plane of air pushing against the magical weave that protects the Breeze from that greater plane beyond, the many and varied forever falling islands and, of course, the magnificent floating Cities of the Breeze...