The kingdom of Wyndia is comprised of six major towers -- Indartsua, Newtown, Makertown, Plantus, Fawtus, and Tawtus. Indartsua is connected to Newtown by an ancient skybridge, however none of the other towers remain connected at all. Balloon is the only way.
But there was a time, hundreds of years ago, when there were eight towers, and each was connected to the next by the Grand Skybridge. Yelm is one of these fallen, forgotten towers. It rests out of view, below the clouds, silent and cold.
To visit Yelm is to visit a ghost of one's own history. It is at once familiar and also very foreign. All around, there is strange evidence of customs that died long ago in the daylight kingdom. And there's also some indication that even as silent as it is, there may be a remaining population -- so to speak.