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 Abyssal Heritage [Fiend]
The chains make noise, and quite a bit of it. Enemies get a +4 bonus on detection feats, and skills when attempting to locate you.
The chains allow you to hurl your weapon, for regular attack damage (15 feet added to the normal range of your weapon) If you hurl your weapon, you get -2 to your attack bonus, and +2 to your damage.