You disappear after mauling your enemy.

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

Target: One creature

Attack: Wisdom vs. Reflex

Hit: 4d10 + Wisdom modifier damage.

Effect: You become invisible and then shift 5 squares. You remain invisible until the end of your next turn.

Published in Player's Handbook 2, page(s) 92.