I'm extrapolating quite a bit with the existing weather angel information, not sure how much it'll be to your liking, but it is sticking very much to the idea of a strong link to a specific area of land.

Some of the weather angel capabilities are quite apocalyptic... Though I guess anyone with an instrument or any major demon could have that capacity too. I don't think I've played in such a high-powered environment before. Hopefully I get it right and don't come across as too power hungry....