Arcane and Spirit magic
The world of Solaria does not contain magic in the traditional sense. Arcane, as a source of power, does not exist. It is replaced by Spirit magic. Spirit magic is what occurs when a person in Solaria contacts the spirits for help in some fashion. This could be as simple as a barbarian calling on his ancestors for more strength to as complicated as making a pact with the 3 realms to create an item of power.