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I had 4 days. Initially, it was 5, but on the fifth day, only two mines remained, which were being captured by 2 heroes; the other six had nothing to do. Therefore, the result in 4 days became obvious. However, I didn't have enough time to upgrade the parameters: I only took a ring +2 for the hero's first level (total: 0-0-5-2). The same story with mercury: I didn't have enough MP to take two more potions (total 11).
I'm glad that on the last day, DeadLord and Elcidere joined us.