Killing Flourish

Combat

You inspire dread in other foes when you slay an enemy.

Prerequisite: Intimidating Prowess, Intimidate 4 ranks, slayer† level 4th.

Benefit: When you reduce your target to fewer than 0 hit points with a melee attack, as a swift action you can attempt an Intimidate check to demoralize all foes within 30 feet who can see your attack.

Source: Advanced Class Guide