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Vulnerability is a curse spell that becomes available at level 66 magic. If cast successfully, Vulnerability lowers your opponent's Defense by 10%. Vulnerability costs 5 Earth-Runes, 5 Water-Runes, and 1 Soul-Rune. However if it is unsuccessfully cast, like all other spells in RuneScape Classic, you will be unable to cast any spell for 20 seconds.
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