Your fast reaction time often allows you to duck magic effects.
Benefit: Once per round, when targeted by a spell or effect that allows a Fortitude save or a Will save, you can instead make a Reflex saving throw. You may use the ability a number of times per day equal to 3 + your Dexterity bonus.
Special: If you have this feat and gain a caster level, you may immediately decide to permanently forgo any spellcasting ability and retain this feat. If you do not make this decision this feat is lost, and cannot be replaced.
Adventurer’s Handbook: Genius Guide Volume 1