I use Inkarnate. Pretty easy to use for map making (and impatient) idiots like me. I thought of it being one huge city but in thinking through a post apocalyptic economy, thought it made sense that it would be divergent (especially since most of the refugees would be remenants of allies of the Empire) and would needs farms and such, with Druidic traditions playing an important role. Also thought that there would be some level of segregation. Bastion would be the base of the Original Emperor and his retinue, with the Dwarves settling in at RiftHammer (and others- primary source of ores and metals), Tal-Kaer would be the most cosmopolitan of them all.Freaking awesome map! How did you make it?
I will say that I assumed your "Hidden City" would be more cosmopolitan.