When the investigator deals damage with studied strike, the opponent must succeed at a Fortitude saving throw or become confused for 1d4+1 rounds. A successful saving throw reduces the duration to 1 round. The DC of this Fortitude save is equal to 10 + 1/2 the investigator's level + his Intelligence modifier. Constructs, mindless creatures, oozes, plants, undead, incorporeal creatures, and creatures immune to critical hits are not affected by this ability. An investigator must be at least 19th level to select this talent.