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I was talking about two heroes because the troops that can be purchased come from two types of castles – a Castle and a captured Necropolis, meaning that 7 stacks from one hero won’t be enough. As for the losses incurred when breaking through the antimagic garrison, they are not important, because further in the Inferno lands, you can buy fast devils from dwellings and, with expert-level Slow, defeat large armies by taking advantage of the fact that the devils don’t receive counterattacks.