Hmmm, interesting, very interesting. I also had such a project going with the help of some other people.
http://www.shrapnelcommunity.com/thr...b=5&o=&fpart=1
Check it out. I had the idea that early age would be age of powerful priest-mage prophets, middle era would be byblical Israel during the reign of Solomon and magic has started to shift away from religion. I also had idea of late era being the era of Kabalists and Rabbis where priestly skills and magic have split for good.
They would be able to summon regular angels, Kruvim and some powerful unique angels. I'm not sure if we can mod national summons though...
All the stuff in the thread would be for Early era.
However then I learned Illwinter has a plan to make a hebrew dreived nation for Dom 3 in some patch so I was kind of demoralized by it.
But if I get someone to help with graphics I'll restart the project.
I even have though up of full names for Sar Elad in all eras...
Sar Elad - Era of Miracles
Sar Elad - The Wise Kingdom
Sar Elad - Cabals and Trade
Oh, and I think that Nephilim would make a fine adversary for early "Sar Elad" as we decided to call it. However your suggestion appears to be quite similiar to Sauromatia which has dark sorceries and lizards.