Worldplane

The layer of reality where nearly all of mortal experience lies. A plane of land that stretches infinitely in all directions.

It can be considered to be the physical manifestation of the metaphysical being Fghn, whose name is sometimes used to refer to the Worldplane.

If one somehow were to manage to travel upwards into the sky at an infinite speed, one would ascend to the orderly realm of Wë. If one were to similarly travel deep into the ground, one would fall into the chaotic realm of La.

If one were to somehow travel across the surface of the Worldplane at an above-infinite speed, one would actually arrive at its edge. Beyond, one would find a realm of madness where nothing follows familiar rules of logic or geometry. If a human could manage the task of navigating such an incomprehensible realm, and were to travel through it at infinite speed, they would have access to all possible realities.

Spirits are capable of  accomplishing all these things with as much effort as a human would walking to and from his desk (if even that; it's debatable wether spirits actually need some form of nourishment. It's possible they don't actually expend any energy whatsoever, and that all of their apparent actions are in fact an optic illusion brought upon by the geometric shape of their multidimensional bodies.

There is an extremely rare state of being called 'being one with the Worldplane' in which the recipient is capable of manipulating non-elemental matter (fghn) as if it were an extension of their own body. This effect can extend from a few meters around a user, to the visible horizon, to even much further.