Dreadful Carnage

Dreadful Carnage (Combat)
Slaying an enemy demoralizes your other nearby foes.
Prerequisites: Power Attack, base attack bonus +11.
Benefit: Whenever you reduce an enemy to 0 or fewer hit points, you can make an Intimidate check to demoralize all enemies within 30 feet as a free action. Enemies that cannot see both you and the enemy you reduced to 0 or fewer hit points are unaffected.

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(BAB +16): You may demoralize opponents within 30 feet as a free action whenever you confirm a critical hit.