So I have come up with the basic cosmology map above. I will get into more descriptions of what it shows as time permits. This is for Pathfinder as it stands right now.
Basic World Building
Medium Magic, on a Decline from High Magic
Interplanetary Travel contained to the Solar System
No interplanetary ship travel. Travel done by gates. (Perhaps the High-Magic tech of the ships has been lost?)
Umbra and Lumina Overlap the Material Plane, Crossover Possible
Umbra is your classic Shadowlands Scenario (Shades and Wraiths)
Lumina would be the Positive Equivalent (Most Ghosts and Spectres, perhaps)
Dragon God Aspects aligned to Seasons
Main Planet (haven't decided name) is significantly bigger than Earth, but much less dense balancing out to normal (as we know it) gravity.
"Birthing Moon" is a Water Moon (Origin of Aquatic Elves, original Elven race. Elves on main world are offshoots)
"Harvest Moon" is a thin atmosphere Wasteland Moon. (Source Goblinoids - Live in underground cave/hive networks. Subsistance on sub-surface fungus cultivation and fauna like giant worms/bugs/etc.)
"Cold Star" is a Brown Dwarf in the system. Has a handful of habitable and non habitable moons. The Winter aspect birthed the Dwarven Races on these moons.
"Golden Sun" is the main system star.
Humans, Halfings and Orcs are native to the core planet.
That's all I can think of. I will expand this as I can. Any comments/suggestions/ are welcome. Even like names of kingdoms, planets, the dragon gods, etc are more than welcome. General bouncing and brainstorming. There are no BAD ideas.
One of the main cities/kingdoms is going to be "Arcadia" just because that's kind of a recurring thing I do in games.