[@Drakey] Yes you can, though I must clarify that Aeons are both a state and a category. For example, you can be a plant mage, and manipulating plant life falls under the Existance Aeon, but that doesn't neccessarily mean you're an Existance Mage. Only once you've achieved complete mastery over every aspect of Existance can you be called an Existance Mage (and therefore an Archetype)