Loss of Will is an utility power available to the Barbarian class at level 6.[PH2:54]
Loss of Will
Barbarian Utility 6
As you turn aside your foe’s attack, you stare into its eyes. Your
enemy now knows that the battle is in your favor.
Personal
Trigger: An enemy misses you with you an attack
Target: The triggering enemy
Effect: Until the end of the target’s next turn, the target takes a penalty to attack rolls against you equal to your Charisma modifier.