Ringing Weapon
Bard Attack 13
A surge of sound rings out across the battlefield as you strike, making it impossible for your enemy to hide its presence.
Special
Trigger: You hit an enemy with a basic attack using a weapon.
Effect: The enemy you hit takes 10 thunder damage, and until the end of your next turn, that enemy grants combat advantage and cannot benefit from partial concealment.
Ringing Weapon is an encounter power available to bards at the 13th level.[HotF:64]