Lyall here. I actually know quite a bit about this place, it seems, if anyone has questions. I can even apparently give a tour of important places. Armin is quite right about the divide, they're called Lightsiders and Darksiders, and Dusklings do in fact cater to both for communication and such.

The city wasn't always like this. There was a plague, or something like, that apparently caused it all, over a millennia ago.

Er, and that's not as long for them as for us, it's only a few generations for them. They live hundreds of yeas. Elves, and all that.