Greater Kiai Shout( Complete Warrior, p. 99)
Your kiai shout can panic your opponents.
Kiai Shout (CW) , CHA 13, base attack bonus +9,
When you make a kiai shout, your opponents are panicked for 2d6 rounds unless they succeed on Will saves (DC 10 + 1/2 your character level + your Cha modifier). The kiai shout affects only opponents with fewer Hit Dice or levels than you have.