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It is best to have a few units with the "Denial" skill, so that you can use magic on them, and if that is not possible, summon Mantises, which "stick" the Chaos Demon to a spot. Be sure to use archers. It is advisable to remove weak units from the battle to avoid losses from neutral creatures.
Под холодную Луной порублю попсу косой (с) Decimacia