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I seem to have the opposite experience; my new druids shoot better, but you write so confidently that I'm starting to doubt myself.
Besides, I also recruit new ones because with them, the elven hero has good defense, a lot of knowledge + due to the channel (after its application), he gains an incredibly large amount of magic (even more than knowledge!!!).
All that remains is to acquire artifacts that increase attack power, and we have practically a hero with unreal characteristics. The bonus to magic works as long as the druids are alive, and they usually live a long time.