Aethers, Aetherbound and spores are all Invested; the only question is if they're invested from Ado, or from somewhere else.
Also, if you want to explain the spirtual realm, you have to touch on the "oneness" where everyplace, and every time are one. Kinda.
This sentence I take some issue with this. As it's commonly understood, all magic (save the aethers) is powered by a shard. Whether it's consciously or unconsciously, all investiture and invested arts were reassigned to one or more shards during or after the shattering. Most, if not all, Invested arts require three things: Intent, or the will to activate a facet of your Art. it's often conscious, but if nothing else, your body wants to Survive and will activate the art regardless of whether you are aware of it. Secondly, you must have a Command. This is what Aons, Metals, and the spoken Commands of awakening are, and this filters a broad intent into a specific move. Finally, most magic needs Initiation, which is the spark that sets the fire; some magic systems are harder than others (Elantris), and others are very easy (Awakening). This forges the connection between you and whatever powers you.