Vestigial Wings( Fiendish Codex I: Hordes of the Abyss, p. 87)
A pair of vestigial wings sprouts from your shoulders.
Your wings aren't formed enough to allow true flight, but they do enhance your ability to jump. You gain a bonus on Jump checks equal to +3 per Abyssal heritor feat you possess. Your wings can also slow your fall. As long as you can take move actions, you can control a fall so that you land without taking damage. You cannot, however, alter the direction you fall.
Because your wings create additional drag while you swim, you take a -2 penalty on Swim checks.