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Finished it again), 6 months, 2 weeks, and 5 days), by the 5th month, 3rd week, I collected all the artifacts; the rest of the time, I was collecting sulfur, and I even had to sell Hellspawn for sulfur :).
Found a bug: above the first castle, there is a gold mine guarded by manticores and demons with a cleaving sword; they always join my side, and they were quite challenging for me :)
Cool map :) I've played it for the third or fourth time, and it's still not getting old :D