Aether is a resource with many uses from fuel used in Aether engines on airships to ingredients in many foods and beverages. When the first
Cities of Blue emerged, they did so in a cloud of Aether, bringing the substance into our world. The
Quantum Fields, fields of blue flowers called Quantums that dwell beneath the blue cities, are a telltale sign of an ether deposit. Why Aether does what it does, as well as its relation to the blue cities, is anybody's guess but it allows flight without the use of hot air, propellers, and other, more physical means of travel.
I really like this and everything else I've read about your world and setting! Can't wait to read more about what you've created! :)
Thanks so much! I appreciate the praise more than I can say =]