Hello the Wastelander, welcome here!
You Asked: the 'magic' in Paravia is based on very real physics - resonance and frequency, (sound and light) - the electromagnetic spectrum, the quantum, and a few things off the edge of what current science can 'measure'. Quartz is piezo-electric, and certain rod crystals (Tourmaline, etc) also polarize light. All of those things have been encorporated, but the physical properties and the esoteric.
As for the compass points: there are SO MANY angles of cultural belief that engage them, it would be hard NOT to 'feel' as if they connected, somehow, somewhere. I DID want to create a unified field - of sorts - between what we have, what we know, and what is fictional and what is playful speculation. I wanted Athera to 'live' and function - and resonate - with many foundational concepts. Not create a 'game' or a 'magic system' so much as create a believable whole.
If I have succeeded, it ought to 'tap into' many root ideas, from a lot of eclectic sources, and also from experience, combined with the unbridled use of the imagination.
As to 'what is not yet disclosed' - heh - the series is not to closure Yet!!!