Hammer's Edge
( Complete Warrior, p. 113)[Style]
You are a master of the style of fighting with a hammer and sword at the same time, and have learned to hammer your foes into the ground with your tremendous blows.
Prerequisite
Improved Bull Rush (PH) , Two-Weapon Fighting (PH) , Weapon Focus (PH) (bastard sword, longsword, or scimitar) , Weapon Focus (PH) (warhammer or light hammer) , STR 15,
Benefit
If you hit the same creature with both your sword and your hammer in the same round, it must make a Fortitude saving throw (DC 10 + 1/2 your character level + your Str modifier) or fall prone.