Smash from the AirSource Weapon Master's Handbook pg. 22
Your powerful and swift attacks can slice ranged attacks out of the air.
Prerequisites: Str 13, Cut from the Air, Power Attack, base attack bonus +9, weapon training class feature with a melee weapon.
Benefit: You can use Cut from the Air against unusually massive ranged weapons (such as boulders or ballista bolts) and ranged attacks generated by spell effects. Spell effects that do not require attack rolls cannot be deflected.