Master Strike (Ex)
Upon reaching 20th level, a rogue becomes incredibly deadly when dealing sneak attack damage. Each time the rogue deals sneak attack damage, she can choose one of the following three effects: the target can be put to sleep for 1d4 hours, paralyzed for 2d6 rounds, or slain. Regardless of the effect chosen, the target receives a Fortitude save to negate the additional effect. The DC of this save is equal to 10 + 1/2 the rogue's level + the rogue's Intelligence modifier. Once a creature has been the target of a master strike, regardless of whether or not the save is made, that creature is immune to that rogue's master strike for 24 hours. Creatures that are immune to sneak attack damage are also immune to this ability.