The earth itself grabs at your enemies, holding them in place for your claws to tear at them.

Encounter   ✦     Implement, Primal
Standard Action      Area burst 2 within 20 squares

Target: Each creature in the burst

Attack: Wisdom vs. Will

Hit: 2d6 + Wisdom modifier damage, and the target is immobilized until the end of your next turn.

  Primal Predator: Until the end of your next turn, while you are in beast form you gain a bonus to attack rolls against the target equal to your Dexterity modifier.

Published in Player's Handbook 2, page(s) 93.