Fortune's Ravagers Rage is a daily power available to the Barbarian class at level 19.[Dr380:35]
Fortune's Ravagers Rage
Barbarian Attack 19
Melee weapon
Target: one creature
Attack: Strength vs AC
Hit: 4[W] + Strength modifier damage.
Miss: half damage.
Effect: You enter the rage of the fortune's ravager. Until the rage ends, you can repeat the rages attack as an immediate interrupt that triggers when an enemy adjacent you rolls a critical hit with an attack and target is triggering enemy.