When Luck of Thorbir is cast on a person it causes what would be normally a successful attack to instead fail in a spectacular fashion. Only by rolling a natural 20 twice will the effect be dispelled before the spell normally expires. The caster can use either pieces of broken dice to have an effect on attacks, or a torn playing card to have an effect on an ability check. (As part of casting the ability check must be named). The effect will last for the next 10 minutes. There is no saving throw. For every level cast over level 2, an additional minute of extremely poor luck will be visited upon the target.