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I'm playing as a "hero." The map has a "medium" level of difficulty, but if you use the game's bugs that haven't been fixed by the developers, it becomes "extremely easy." The bug is this: as soon as the hero casts "evasion," the opponent flees with an army that has every chance of winning the battle. The same thing happens if you have a dwarven composite artifact that automatically casts "evasion" before the battle – without inflicting damage, the artificial intelligence surrenders with any army size.
Does anyone know if there are any fixes for this bug? (otherwise, the map turns into a meaningless beating of the computer opponent)

Added 6 minutes later
Dark magic is learned by developing "keen eye" from the "Education" skill line – along the way, you encounter witches and mummies, and as a result, in the Dungeon, the hero has, with developed dark magic, a general slowdown and general distraction – this is more than enough to defeat everyone.