Infernal Clamour is a heroic tier feat.[AP:128]
Benefit: When you use your infernal wrath racial power, each of your allies who can see you gains a +1 power bonus to his or her next attack roll against the triggering enemy before the end of that enemy’s next turn.
Update (4/9/2010)[]
In the Benefit entry, replace “the enemy that hit you” with “the triggering enemy before the end of that enemy’s next turn.”