Troth Glenbeard was a dwarf with a mission. And that was destruction.
From there, things happened. And the Irondeeps got a Subterranean-Transport-System-That-Moves-Things-Around-Faster-Than-Equine-Means (aka, in modern-speak, a subway).
A world where there is a finite amount of magic present in the world, and it's almost used up. With the winds of magic being weak and unstable, how will nations built on the heavy use of magic survive?