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I don't really like the Silence skills because you often have to guess, like in a lottery. For example, against Light Elves, you might try Silence Chaos or Silence Light. If you're lucky, it works, but if not? Also, there can be surprises. For example, against a Necromancer, you choose Anti-Darkness, but the Necromancer has maxed out his Summon skill, knowing that Orcs will be afraid of Darkness.