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A goose gives 2k gold per day, what are you talking about with 13-15 gold? And what do arts have to do with it?
P.S.: Only those who played Heroes in campaigns and scenarios at the highest difficulty level and died only a couple of times in their entire life, with no more than 20 autosaves during that life, will understand me. And talking about having creatures of the first and second levels with a fortress and a stronghold built on the second week is just lame.