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Dissonant Imbuement
Bard Attack 17

Your strike creates a tone that resonates within your opponent, disrupting its defenses.

Melee weapon

Target: One creature

Attack: Charisma vs. AC

Hit: 3[W] + Charisma modifier damage. Until the end of your next turn, the target takes a penalty to AC and Reflex equal to your Intelligence modifier.

Dissonant Imbuement is an encounter power available to bards at the 17th level.[Dr383:55]