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Weaken is a magic spell. Weaken costs 3 Water-Runes, 2 Earth-Runes, and 1 Body-Rune, and has a level requirement of 11. If Weaken is successfully cast, your opponent's strength is reduced by 5%. However if it is unsuccessfully cast, like all other spells in RuneScape Classic, you will be unable to cast any spell for 20 seconds.