Interesting mod there...reminds me of that mod I was planning to make with a nation for each element and appropriate mages and troop attacks.
For example: Fire (Abysia) would have very high level fire mages with a random pick somewhere and infantry with flame strike, fire breath, etc.
Blood magic gets life draining infantry.
Death gets diseasers and banefire, astral gets mind bLast and enslave mind...and so forth. Not sure what nature gets...sleep vines maybe.
I might make that sometime if I'm not lazy.