Dark Secret

Your character carries a dark secret with them (Known only to the Player and the GM) which if others knew, could put them into danger as well. Whatever the secret, powerful beings are willing to kill to either keep it hidden or bring it into the light - and the player character is likely key to it. If other party members learn this secret they find themselves targets as well and be forced to add this Bane to their character as well (without gaining the base experience boost of course)