Song of Flagging Strength
Bard Attack 19
Your song seems to sap the spirit of your enemies, taking some of the zest of battle out of them.
Personal
Effect: Until the end of the encounter, your skald's aura gains the following effect: Twice before the end of the encounter, when you or one of your allies hits an enemy in the aura with an attack, that enemy is weakened and takes ongoing 10 psychic damage (save ends both).
Song of Flagging Strength is a daily power available to bards at the 19th level.[HotF:66]