Iron Hammer Rage is a daily power available to Barbarians at 15th level.[PH2:57]
Iron Hammer Rage
Barbarian Attack 15
Even the iron that sleeps in the earth has its primal spirits, which fuels your mighty attacks to dash your foes against walls and large trees
Melee 1
Target: one creature
Attack: Strength vs AC
Hit: 3[W] +Strength modifier damage and you push that target a number of squares equal to your Strength modifier.
Miss: Half damage and you push the target 1 square.
Effect: You enter the rage of the iron hammer. Until the rage ends, whenever you hit a creature with a melee attack, you push the target 2 squares. If the creature is adjacent to blocking terrain at the end of the forced movement, then the target takes damage equal to your Strength modifier.