Editing Dark Sun (section)

===Cosmology===
Athas is... ''different'' to the standard realm in the [[Great Wheel]]. Looking across various sources (most prominently "Defilers & Preservers" and "Earth, Air, Fire & Water" for Dark Sun itself) reveals that Athas is connected to only a small handful of planes; the Gray, the Black, and the [[Elemental Planes]]. Further differentiating its cosmology, whilst Athas retains connections to the four standard "True" Elemental Planes (Earth/Air/Water/Fire), it only has four Paraelemental Planes consisting of Magma, Rain, Silt and Sun.

The Gray is essentially the afterlife of Athas; a dreary, endless limbo realm of dismal mists, which serves to blockade Athas from both the [[Ethereal Plane]] proper and the [[Astral Plane]]. Depending on who you ask, it's either Athas's "Border Ethereal" or an analogue region for the Astral Plane.

The Black is analogous to the [[Plane of Shadow]], and mostly serves as a prison for Rajaat.

It's noted that Athas is unusually close to the [[Elemental Planes]], and this is, in part, why the world is so screwed up.

Athas can actually interact with the [[Great Wheel]], and be reached by [[Spelljammer]]s, but it's extremely difficult to do so - the whole thing is effectively a sealed zone, as if something trapped the entire pocket of reality inside a locked room.
* The [[Githyanki]] are known to have opened a portal to Athas and tried to invade... then they ran home with their tails between their legs and closed up the portal, before leaving behind the proverbial sign saying "Do not open this fucking door!" Athasian [[Gith]] are believed to be the degenerate remnants of githyanki stranded here as a result of the failed invasion.
* The Mists of [[Ravenloft]] can also reach into Athas and pluck victims into its embrace. There's even an Athasian [[Domain of Dread]] called "Kalid-Ma". It says something about life on Athas that being stuck in the [[Demiplane of Dread]] is actually perceived by most Athasians as a step up.
* The [[World Serpent Inn]] hosts at least one known two-way portal to Athas.