Nargott
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Too bad. Another question for an experienced expert: is it true that there is an unused extra_expert spell level in the game, and if so, how can it be activated?
It's easier to understand in practice, open the WGE mod archive and look at the caster creatures there; it is used by many (for now). Then open the corresponding spells there, and you will see how to add it.
Where are all the changes related to the town located? (inside the wargame tactics.pak file)