You expose a hole in your prey's defenses, creating an opening for another strike.

Encounter   ✦     Beast Form, Implement, Primal
Standard Action      Melee touch

Target: One creature

Attack: Wisdom vs. Reflex

Hit: 2d8 + Wisdom modifier damage. The next attack against the target before the end of your next turn is made against the target's lowest defense.

  Primal Guardian: If the next attack hits the target, the attack deals extra damage equal to your Constitution modifier.

Published in Player's Handbook 2, page(s) 90.