Terrifying Presence is a daily power available to the Barbarian class at level 19.[HotF:51]
Terrifying Presence
Barbarian Attack 19
Melee weapon
Target: one creature
Attack: Strength vs AC
Hit: 4[W[ + Strength modifier damage.
Miss: half damage
Effect: Until the end of the encounter or until your defender aura ends, enemies in your defender aura grant combat advantage and cannot make opportunity attacks.