Looming Threat
Barbarian Attack 7
An ally might have raised a foe's ire, but once you strike, that enemy must pay attention to you.
Melee weapon
Target: One creature
Attack: Strength vs. AC
Hit: 2[W]+Strength modifier damage. If the target is marked by an ally, the attack deals 1[W] extra damage. You then mark the target until the end of your next turn.
Rageblood Vigor: Until the mark ends, you gain a power bonus to damage rolls against the target equal to your Constitution modifier.
Looming Threat is an encounter power available to Barbarians at the 7th level.. [PrP:15]