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Please helpby adding links that are relevant to the context within the existing text. (February 2016)
Effect: A thundering weapon creates a cacophonous roar when striking a successful critical hit. A thundering weapon deals an extra 1 to 8 points of sonic damage upon a successful critical hit with a weapon that has a x2 multiplier, an extra 2 to 16 for a x3 multiplier, and an extra 3 to 24 for a x4 multiplier.