SRD
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Weakness reduces attack by a fixed amount; repeated application of the attack reduction effect does not stack, and it lasts for a limited number of turns equal to the hero's spell power. A weakening strike reduces the target's defense and attack by 2 each time it hits, and the effects of the strikes stack – i.e., hitting the same target three times reduces both parameters (defense and attack) by 6, and this effect lasts until the end of the battle.