Nightmare Striker
Your faerie fire not only illuminates your foes, but it also shows you their weaknesses.
Prerequisite: Improved Unarmed Strike, Nightmare Fist, Nightmare Weaver, Stunning Fist, Heal 5 ranks, ability to cast faerie fire.
Benefit: While a faerie fire you have cast (not one cast from a spell completion or spell trigger item) outlines an opponent, the DC for that opponent to resist your Stunning Fist attempts increases by +2. If you hit an opponent with a Stunning Fist attempt, and that opponent fails her saving throw, you can render the target shaken for 1d2 rounds plus 1 round for every 5 by which the opponent failed her save.
Source: Ultimate Combat, p. 111