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This ability is excellent if you know how to use it: in battles, it can easily eliminate 3 units... it has helped me many times; I remember once, I was playing as Sylvan against Necropolis, and the Lich, Undead, and Vampire were all eliminated in one moment. Without these units, the losses could be many times less... but I don't play as Sylvan very often... At first, I agree, it's the most useless skill...