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I'd like to disagree about the Imps. In my opinion, Dryads are better than Imps! They only lose out in terms of damage (Dryads have 2, Imps have 2-4) and growth rate (10 and 16 respectively), and they cost 10 gold more, but that's not a huge difference. In every other aspect, Dryads are superior, and their retaliatory attack is a major advantage!