Shaman Feature Call Spirit Companion

Your soul reaches out to your spirit friend, which faithfully appears at your side.

At-Will        Conjuration, Primal
Minor Action      Close burst 20

Requirement: Your spirit companion must not be present.

Effect: You conjure your spirit companion in an unoccupied square in the burst. The spirit lasts until you fall unconscious or until you dismiss it as a minor action. The spirit occupies 1 square. Enemies cannot move through its space, but allies can. When you take a move action, you can also move the spirit a number of squares equal to your speed.
    The spirit can be targeted by melee or ranged attacks, although it lacks hit points. If a single melee or ranged attack deals damage to the spirit equal to 10 + one-half your level or higher, the spirit disappears, and you take damage equal to 5 + one-half your level. Otherwise, the spirit is unaffected by the attack.

Update (9/10/2010)
Add the following Requirement entry above the Effect entry.

Published in Player's Handbook 2, page(s) 120.