Wet with your enemy's blood, your claws lash out at any foe adjacent to you that dares to attack.

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

Target: One creature

Attack: Wisdom vs. Reflex

Hit: 2d6 + Wisdom modifier damage. Until the end of your next turn, you can make a melee basic attack as an opportunity action against any enemy adjacent to you that hits or misses with an attack.

  Primal Predator: You gain a bonus to the attack rolls of the melee basic attacks equal to your Dexterity modifier.

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