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Echoing Weapon
Bard Attack 3

You place your hand on the weapon, and it begins to rumble quietly, as though a booming thunderhead is contained within.

Melee 1

Target: One weapon

Effect: Until the end of your next turn, the next weapon attack made with the target weapon deals 2d6 thunder damage to one target of the attack, regardless of whether the attack hits or misses.

Echoing Weapon is an encounter power available to bards at the 3rd level.[HotF:61]