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I wouldn't say that Nature is an attacking castle (see the battle with Lu); dragons, water creatures, elves, heroes – they all shoot. If you start approaching, on defense, you have griffins (unicorns) and mantises, and you can also summon phoenixes. You can just sit there and wait.
So, Nature is a versatile castle; it can both attack and defend.
P.S. I'm not writing about wolves and fairies; taking them into the final battle... hmm... and there are so few of them left, at least for me.