Bloodseeker's Rage is a daily power available to the Barbarian class at level 1.[Dr380:34]
Bloodseeker's rage
barbarian attack 1
Daily ✦ primal, rage, weapon
Melee weapon
Target: one creature
Attack: Strength vs. AC
Hit: 3[W] + strength modifier damage
Miss: half damage
Effect: You enter the rage of the bloodseeker. Until the rage
ends, you can make an opportunity attack against any
bloodied enemy adjacent to you that shifts.