Marlita
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I played this mission on the hero level. At first, when I went to the surface, Miv relentlessly attacked me. Then I started over to develop dark magic. It saved me. Miv had a decent army advantage, but thanks to dark magic, especially "Battle Fury," she was defeated! I passed this battle on the 4th try, after I understood which spells to use. And in the end, I probably had half of my army left. Taking the city was no longer a problem. I just didn't understand the final cutscene...