Thanks to everyone who voted for me!

And jbgibson, the reason I went with it the way I did is because the rest of that nation, is within a giant cavern system, to almost where you can't see the ceiling. Albeit, I did have some mainly artistic reasons for the roofs, I didn't think flat roofs would really match the feel I wanted to give the Trobbes, and their 'city'.
Anyway, the original is that there is basically a whole new world down there with special breeds of plants that are acquainted to growing on a very powerful light emitting crystal which was in the first draft above the keep. Reason I didn't go with it: I didn't want things to be too light and didn't think it'd match the feel.
Hope that made sense.

I had a great time working with it, but sad I couldn't finish. Again, thanks to all who voted for me. I will finish this