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If we give armorers 2.5 percent, their advantage at level 20 will be - 0.775/0.85 ~0.9, which is equivalent to 4 extra defense, if our defense equals the enemy's attack. If our defense is greater than the enemy's attack (as usually happens), then the armorer's advantage is even smaller in the primary equivalent, since each primary point of defense becomes more and more valuable. Something like that.