Achilles Heel: Geas
Achilles heel: Geas (Irish myth) by Dragon blaze 99
First, it is a vow or obligation placed upon a person (usually a hero, such as Cuchulainn in Irish mythology). Traditionally, the doom of the hero comes about due to their violation of such geasan, either by accident, or by having multiple geasan and then being placed in a position where they have no option but to violate one geas in order to maintain another.
Whenever the character fights against his geas he is – 5 initiative, -5 Strike, -6 parry and -8 dodge, he also gives up auto dodge if any and powers are weakened by 25%. If the character ignores the geas 3 times his powers are striped for 24 hours, if the geas is still disregarded after that powers are gone for 30 days, if the character does not right this action after that then his powers will be permanently taken.
Examples of geas: Must protect men, women or children in need, must defend the innocent, must not live above ground, etc. There are hundreds of ideas but the Gm should make it applicable to his game. The character can sense those that fall under his geas with in this ME in miles.