Communion is a Power Style that allows one to communicate with intelligences and become a conduit for the intelligence's power. The amount of power that can be used is determined solely by the intelligence contacted.
The process for Communion requires a meeting of consciousness between two parties, of which either party can initiate or refuse. It is usually the lower form of intelligence that preforms the necessary rituals of contact. If both parties agree to a covenant, then Communion is established; the initial ritual no longer needed for contact.
Communion with one intelligence is Communion with all similar intelligences. Example: if one established Communion with a ghost (dead person), then all ghosts one encounters would be forced to honor the covenant, though the level of Communion would differ.
Communion is measured by percentage, which increases by earning the respect of the intelligence. As the percentage increases, so does the amount of power one can borrow from the intelligence. The closer to 100%, the more that can be borrowed, with 100% being everything that intelligence is. The more higher on the plane of existence the intelligence, the harder it is to establish a covenant.