-As much as possible of the Dominions battle system should be used.
-Try to only use Dominions units as monsters (not too hard considering all the myth Dominions draws on)
-A random god generator, preferably based on the current god title system. Each game a set of gods would be rolled, and each title would add a diferent blessing/curse they could give (so, one with the title 'god of courage' could bless you to resist fear effects, or bestow a curse that any creature is able to scare you).
One thing that would be a bit difficult to transfer is blood magic.
Blood magic? Well, assuming I don't manage to get some sort of pets/companions system in (which would be perfect for blood slaves ), I can always have blood magic drain the caster's HP or Constitution...
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The Ed draws near! What dost thou deaux?