Ancient Forebears's Rage is a daily power available to the Barbarian class at level 29.[PrP:23]
Ancient Forebears' Rage
Barbarian Attack 29
Melee weapon
Target: one creature
Attack: Strength vs AC
Hit: 6[W] + Strength modifier damage.
Miss: half damage.
Effect: You enter the rage of the ancient forebears. Until the rage ends, whenever you roll a 1 or 2 on a damage die for a primal attack, the roll changes to the die's maximum value.