2 cents for the idea pool:
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2-Piece Bonus: Double the effectiveness of all Shouts. Feared or stunned enemies take double damage from your primary skills.
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4-Piece Bonus: Hitting with a primary skill increases your damage reduction by 5% for 10 seconds, stacking up to 10 times.
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6-Piece Bonus: Primary skills deal 1000% increased damage per stack.