Nargott
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What’s wrong with having an extra tempo in terms of development? It’s structurally simpler; there’s an extra building, and no questions arise about having too many creatures, money, or experience, or too little. Moreover, the building is neutral and generates money (tempo + gold). The tempo of the town + gold versus the tempo of the heroes + the resources they manage to acquire. If this bonus turns out to be unbalanced, then we can look for alternatives.