Far realm

The Far Realm was a plane of madness situated very far from the planes of the standard cosmology. This maddening realm was feared for its power to twist unfortunate visitors into gruesome monsters, and it was from here that aberrations came.   An entire world, a plane like ours in name only. An endless storm with no ground to rage on, winds without rain that would peel flesh from bone and erase both in an instant, massive on a scale that would engulf our entire world dozens of times over and never be left any less hungry.  

Geography

The Far Realm comprised an infinite number of layers. Unlike the layers of many Outer Planes, these layers were very thin, ranging from an inch to a mile in thickness, each separated from the next by around ten feet. These layers were also transparent, and travelers could glimpse through twenty or so, with each appearing increasingly blurred.   On the Far Realm, landmarks and entities were multidimensional, existing on multiple layers at once. One could imagine the layers as a stack of translucent parchment, with a given feature appearing as a single mark upon each page. Taken individually, such marks might have no meaning, but when viewed all together in the stack, they seemingly coalesced into a three-dimensional object.   Gravity and time did not exist in the Far Realm. The only kind of movement possible on the Far Realm was passage between layers, which needed only a thought. The air was as viscous as syrup—it was possible to swim through it, though it was very hard.  

Inhabitants

The Far Realm had many different inhabitants, many of them sentient. Some resembled mammals, while others were insectoid. Some were even as powerful as deities (whether they are sentient or not may be hard to say). When meeting beings from the Prime Material plane, the Inner Planes, or the Outer Planes, Far Realm entities often adopted forms of creatures familiar to the viewer.   Mortal travelers to the Far Realm would usually be subject to insanity. All sorts of horrifying changes could occur to them, such as eyes sprouting from their palms. They could also relive a hundred warped memories simultaneously.