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Specifically for the achievement, I hired a new hero. I didn't use my main hero to win. My main hero didn't have a good strategy. I hired a hero and gave him the necessary perks. Tactics are needed to position the army closer to it so that it doesn't throw demons around randomly. Therefore, we position the army as close as possible to it (it throws demons at those who are further than 2 cells away). And then I defeated the goat.
