Natural Bully( Champions of Ruin, p. 21)
You easily terrify weaker adversaries.
Intimidate 6 ranks,
All enemies within 30 feet of you that have one-half your Hit Dice or less are bullied; they take a -2 morale penalty on attack rolls made against you. A bullied enemy that succeeds in hitting and damaging you is no longer subject to the penalty and cannot be bullied by you for 24 hours. Creatures immune to fear effects cannot be bullied and do not take the penalty on attacks rolls to hit you.