There is a factor of +20%/-20%. For example, if a unit can deal 5 damage to unarmored, the max damage it can deal is 5 + (5*20%) = 5 + 1 = 6. The min damage it can deal is 5 - (5*20%) = 5 - 1 = 4.
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"Everything is impermanent. The only thing that is permanent it impermanence itself."