SpellcutSource Weapon Master's Handbook pg. 22
You can weaken waves of harmful magic energy with weapon blows.
Prerequisites: Str 13, Cut from the Air, Power Attack, base attack bonus +9, Spellcraft 1 rank, weapon training class feature with a melee weapon.
Benefit: Once per round, you can use your base attack bonus in place of your total saving throw bonus for a spell, spell-like ability, or supernatural ability that either allows a Reflex save or is not a melee attack and targets only you.