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Jearn: The planar home of Adventurers (also identified as Portal I from the Alpha Site)
Cahyali: A smaller world where adventurers also hail from, which features much larger landmasses than Jearn.
Infero: The land of the dead, the fallen, once-beautiful plane of Cielo. It is the passing place that souls go to before reaching their afterlife.
Kurago: A plane of existence attached to most other planes.
Alpha Site: The Centralia Guild of Wizzards extra dimensional portal farm.
The Elemental Planes: Where the sources of elemental magic flow and ebb from, various types of magical flux pass through the Planar Sea and collide into the planes of Jaern and Cahyali.
The Planar Sea: The extradimensional space that planes of existence, well, exist in. Theoretically inhabitable to life (that we know of), and there is no current way to travel directly to the Planar Sea.