I do have noticed a sore lack of AI hostile spellcasting. I´m concerned of the mod scrambling the AI´s ability to discern which spells to use (as in using all its casters to cast final sacrifice on you, instead of something that actually works)
For that matter: even Ermor middle shows a suspicious lack of undead units...
PD:I´m going to try making it just holy. Most nations dont have wizard-priests (I think, at least), so it should help with those.
Actually, it might still be problematic with Ermor, Pythium, and Mictlan.
Another idea I had was using some exotic path combination, AKA: one that no nation had by default (as in l00% probability). That way at least *some* of the spellcasters would be unable to cast that spell, and would cast others.