Lines of Rage is an encounter power available to the Barbarian class at level 17.[PrP:19]
Lines of Rage
Barbarian Attack 17
Straining your muscles to the point of agony. You channel the pain into a devastating blow.
Melee weapon
Effect: Before the attack, you can take 2d8 damage. If you do so, the attack deals 2d8 extra damage.
Rageblood Vigor: You can take 1d8 instead of 2d8.
Attack: Strength vs AC.
Hit: 4[W] + Strength modifier damage.