Well it's pretty easy to make the nation better for AI, just lower the cost of the recruitables by about 20 gc and 10 rec each

the AI will send hordes of pretty strong, high HP and 2 attack troops your way then(would work for any nation though, but for these especiallY) Ow and set price for the wyrmlings too 999 so they don't get recruited. The AI probably won't use the summons very well but... the recruits and commanders are pretty decent in their own right. Try the nation Gandalf

(Í've tried to balance it for MP so it's weaker since very strong troops and commanders are more easily exploited by human players, especially the once they get to the summons I made with all sorts of magic, abilities and resistances)... of course it would only take a few letters/numbers in the .dm file to make all summons recruitable too... which would severly overpower the nation
Anyway HOney could use my (stolen) graphs as temp replacements and update the mod later on. There are other endgame summons mods though (not played them... I never get to end game summoning.. to be honest I've never seen any of the angels, devils nearly only on enemies in MP and one SP game (demon monkeys) etc.
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fantasy and
sci-fi? Try the total conversion
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Dragons wanted? Try the
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In for a whole new sort of game? Then try my scenario map
Gang Wars.