Blunt Trauma (3.5e Feat)
From D&D Wiki
Blunt Trauma [General, Maneuver]
Hit harder with blunt weapons against creatures with damage reduction.
Prerequisite: Str 13
Benefit: When you are wielding a blunt weapon and your attack is reduced by damage reduction, increase the damage you deal by a maximum of 5 points. The increased damage cannot exceed the attack's original damage.