We will be adding this to the next FAQ/Errata update...
(Which is currently under review by PCI)
Quote:
Effect: Practitioners of the Primal ways become a bridge between the mortal and spiritual realms.
You can call upon these sprits to grant you a boon; this boon takes the shape a single spell, from the Corpus, Illusions, or Control Traditions as long as you are of equal or higher Tier then the spell and that it is not limited to a specific Arcanum such as Mind Lock (Elder) or Clairvoyance (Psionic). For the next 24 hours you may cast that spell as a Primal spell utilizing both your Arcanum (Shamanism) skill and (Ch).