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Thank you for the scenario. It turned out to be quite challenging. It took me 3 attempts to complete it with the hero Naadir, and it involved a very long search for the ideal starting point. I reached the final stage at the end of the 3rd month (closed all 3 portals in 5 weeks), easily defeated the 3 guardians, and fought the fire elemental for a long time. After 10 attempts and a visit to the mentor, who consisted of 156 liches (I started raising them from week 5), I had only 1 hit point left, but I won. In the end, even with Naadir, it was difficult to reach the final stage without any losses. Maybe I'll try with other classes. It seems that only Vittorio has successfully completed the current version, or has anyone else managed to do it with other races?
Added 20 minutes ago
If anyone decides to play with a hero, I'll leave a starting save file just in case. Skills: Marksmanship at 2, Fire Warriors at 6, Logistics at 8 or 9, Path of Warriors at 13 or 14. In the castle, at level 5, there's a Phoenix with Vampirism.