SRD:Bracers of Defenselessness
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Bracers of Defenselessness: These appear to be bracers of armor +5 and actually serve as such until the wearer is attacked in anger by an enemy with a Challenge Rating equal to or greater than her level. At that moment and thereafter, the bracers cause a –5 penalty to AC. Once their curse is activated, bracers of defenselessness can be removed only by means of a remove curse spell.