The city of Aurora is city built recently (since the effects of the spellplague). It is a very unique city. The first reason is because it is built atop of an earthmote. That in itself doesn’t make it really unique. It because really unique because that earthmote actually is connected by a stream of earthmotes used to make a land bridge with the larger earthmote. To top it all off, most of the earthmote and the surrounding earthmotes are composed of lunate.