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I completed it on Veteran difficulty in 5 months. At first, I tried playing as a hero, but that horde of Orcs quickly overwhelmed me, and they all had Chaos Resistance and Summoning skills, which I kept getting hit by. On Veteran, I had more luck, and by the end of the third month, I had dealt with the Orcs. I had problems with the Dark Elves until I killed two of their main heroes. Overall, it was interesting and moderately challenging. However, the final heroes were disappointing... Glen and Carfelt are still somewhat decent, but Harold, with his Combat Power, huge stats, mana reserve, and artifacts, casts such spells... In short, he needs to be adjusted somehow.
Thank you to the author for the map and good luck with future projects.