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I definitely cleared all the mods. Now everything seems to be working fine; I reloaded the save, cleared the area near the portal to the altar, and collected a couple of stacks of skeletons. When I combined the army, I had 16 Archliches, 65 Greater Vampires, and almost 600 skeletons. Zoltan didn't dare fight my Markel, so I continued to level up in the center of the map. I reached the witch, but it turned out to be too late; the traitor Lord Azran attacked on the very next turn. In a direct battle with him, the losses were significant, but thanks to the battle mechanics, I killed him in one turn on the second attempt :D Sharp Mind paid off.