Foundational universe information

For me the primary attraction of an RPG are the characters and their interpersonal interactions. Second, the world the characters inhabit. That's where I'll start:

The world I have endeavored to create is a neo high fantasy world that borrows heavily from my favorite aspects of philosophy and science fiction. But instead of science explaining the world we have a mystical physics of my own design.

The world or worlds are not unlike a giant solar system where each world has a set of both physical and spiritual coordinates set inside a constantly bubbling aether. The Aether is a wild dual planar energy source putting forth both physical energy and matter, and spiritual/mental energy. The physical coalesces to form the worlds and everything in them. The psychic energy forms thoughts, ideas, emotions, and also conscious minds. The minds formed amidst the aether must constantly fight to retain their existence and not be re-absorbed back into the Aether. Life in the physical realm is at first chaotic with the soul of each world hovering in the sky covering the worlds with blistering soul-light. As these new worlds age the barrier protecting the worlds from the Aether begin to decay. When this happens leakage called Zoal spreads throughout the worlds dimming the soul and creating respites in the endless day. Thousands of years pass until the barrier almost completely decays and caustic amounts of Zoal are released. The hours long nights turn into days and weeks, until the now dying world enters period of endless night. Eventually the barrier completely shatters and aether swarms through the cracks until it dissolves the world and all its inhabitants. Short as this cycle may be some civilized species have taken root and thrived. A few of these intrepid fledgling civilizations have managed to create long tunnels through the Aether that span into other worlds.  These links in the world have eventually led to a long chain of worlds called the Grand Series; where our story takes place.