Hammer's Edge

(Complete Warrior, page 113, DnD 3.5)

[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, Two-Weapon Fighting, Weapon Focus (bastard sword, longsword, or scimitar), Weapon Focus (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.