Greater Augment of War is a daily power available to the Cleric class at level 19.[Dr384:19]
Greater Augment of War
Cleric Attack 19
Melee touch
Target: One ally's weapon
Effect: Until the end of the encounter, all attacks made with this weapon deal extra damage equal to 5 + your Strength modifier. When the weapon hits an enemy, that enemy is slowed and grants combat advantage to you until the start of the wielder's next turn.