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Um... First of all, what can a mage do against a druid when the druid has antimagic? Nothing. But with a "summoner," the mage will get hit hard. Illusions are good, of course, but the chance of having more illusions than summoners is small, and even if you create illusions, you won't be able to cast other spells anymore. And the druid doesn't even need to cast Dragon's Strength; it might even be worse. So... magic of Haven is certainly very useful, but against a large army...