Your spirit companion lets out the terrible roar of the Great Bear and smashes its heavy paw into your foe. The presence of the bear spirit is impossible to ignore.

Encounter   ✦     Implement, Primal, Spirit
Standard Action      Melee spirit 1

Target: One creature

Attack: Wisdom vs. Fortitude

Hit: 3d10 + Wisdom modifier damage, and the target is marked until the end of your next turn. Until the mark ends, whenever the target makes an attack while adjacent to your spirit companion, the target takes 1d10 damage and is knocked prone after the attack is resolved.

Published in Player's Handbook 2, page(s) 134.