Crushing Strike

 
Prerequisite(s): Weapon Focus (Bludgeoning Weapon), Weapon Mastery (Bludgeoning Weapon), Weapon Specialization (Bludgeoning Weapon), Proficiency with a Bludgeoning Weapon, Base Attack Bonus 14+
 
Benefit: When you use a full attack action while fighting with any bludgeoning weapon, each attack that connects beats down your foe's defenses, granting a cumulative +1 bonus on attack rolls until the end of your current turn.
 
Source: PHB II