Smashing Style (Combat, Style)Source Weapon Master's Handbook pg. 17
Your hammer blows dent armor, hampering your opponent.
Prerequisites: Str 13, Improved Sunder, Power Attack, Weapon Focus with the chosen weapon.
Benefit: Choose one weapon from the axes, hammers, or flails fighter weapon group. While using this style, when you succeed at a sunder combat maneuver check against a suit of armor worn by an opponent, you can immediately attempt a bull rush or trip combat maneuver against that target with the same combat maneuver bonus. This maneuver does not provoke attacks of opportunity.
Special: A character with the weapon training (axes, hammers, or flails) class feature can use Smashing Style with any axe, flail, or hammer, respectively, in addition to the chosen weapon.