Over centuries of scientific advancement, the cosmography of the universe has been continuously redrawn as understanding of how the planes of existence interact with each other has improved. Current scientific models suggest a complex, multi-dimensional hypersphere composed of 22 planes: the material, astral, fey, ethereal, shadow, hadal, and outer planes. The first six of these are organized into near-identical pairs, mirroring each other at different energy states, while these pairs are bordered by the 16 outer planes.
The Prime Planar System
All star systems are pockets of what is called
wildspace: manifestations of the material plane which exist within the greater astral plane. The Feywild and Shadowfell function as mirrors to these material plane bubbles, existing in parallel with each system in opposing cosmic "directions." The hadal (or "elemental") plane is the the transitive astral-analogue plane for the Shadowfells, and exists at a lower energy state than the rest of the planar system. By contrast, the ethereal plane is the transitive astral-analogue plane for the Feywilds, and exists in a higher energy state than the rest of the planar system. Both function, therefore, as a sort of hyperspace and subspace pairing with normal space. Being the source of magic, the ethereal plane lends its energy to the lower planes via the Weave, which is then harnessed to fulfill the extreme energy cost of
spelljamming.
Creation Myth
It is said, in the most ancient draconic lore, that the cosmic dragons Tiamat and Bahamut were the creators of the universe. They worked in perfect harmony to bring the planar system into existence, but after the God Invasion and the shattering of their beloved child Sardior, they fell into conflict. Legend tells that the two grand beings became sealed away in the heart of the galaxy, within the Cataract, where creation itself could not bear the weight of twin demiurges and so collapsed in on itself around them.
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