well there are several things against this: reanimators give the option to get exponential growth and would make the race even more similar to insects. with the carrion woods spell your can't get exponential growth, just an increase based on your provinces.
We can't onebattlespell modded spells and I don't think the spell you want already exists.
I admit that my solution wouldn't be very usable by the AI (though I doubt the AI will get the best out of reanimating either.) Being similar to current vanilla nations isn't a problem it's actually a good thing. The problem is that the nation would be VERY VERY reliant on that spell and has no back up strategies if it's brought down. (which would make it sort of interesting to keep saving gems so you could recast it or keep reinforcign it). This would fit the theme since mothernature seems to put all bets on plants and has stopped using mammals.
I sort of thought about your plants idea too and I certainly like the story you are telling (fungi/trees/etc etc) but somehow I can more easily imagine algae getting into space than mushrooms and trees...
If I use the carrion woods spell I'd have like 7 or 8 troops which could all be GoRed to 7-8 different commanders. That is a decent basis for a nation with added summons. A think to keep in mind is that you probably can't generate leaders directly with carrion woods (I think)
Another thing I'm thinking of using is the eater of the dead. I like the idea of an increasing mass of algae (?!?) that grows while adding biomass and then become uncontrolable.
I could just change the pic and the stats of the 4 eater of the dead forms then I'd make the first form quite a bit weaker. If you get that form as a rare from forests (I think you'll get multipele of them since I doubt the uniqueness is checked that way) then you could GOR them and you'd haev multipe grown masses .. and eventually they could go on a rampage (That form will be plenty powerfull still
) I'm not sure wethere they'd shift shape if they are not GORed but I guess they might since it could be checked regardless of being a leader or not.. not sure if they'd go on a rampage then though. I think I'll experiment with this sometime
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