Does Absorbtion Runes stack with that reduction already put onto armor?
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Yup, so if you have 1 (minor/major/superior) absorption rune, 1 piece (Ascalon/Knights) armor and a shield with damage reduction they will all stack.
So a lot of hammer Warriors are using 1 damage absorption rune, 1 piece of knight's (or Ascalon) armor, Stonefist Gauntlets (lengthens Knockdown duration), Dwarven Helm (+1 hammer mastery) and Gladiator's armor for the rest.
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