Traits modify aspects of gameplay, granting a benefit in one area at the cost of hampering another. With the exception of Wild Wasteland, which has a less direct effect on gameplay, each trait modifies (and hampers) the Courier's statistics in some way; this can include Primary statistics, Derived statistics, or SPECIAL points and skills. During character creation the Courier may choose a maximum of two (with a minimum of none at all). The add-on Old World Blues makes it possible for them to re-pick the Courier's assigned traits.