This is a basic plan for the Ordial Plane in my campaign. I shall update this as I get more ideas. Eventually I'll put stats up for the creatures, but for now, you just get this lackluster information.
Info:
Linking the planes of Belief and Substance, the Ordial Plane embodies Information. There are three layers. Each is visible in the sky like the layers were arranged like a triple helix. The first layer consists of enormous red fields divided by the occasional hill, and the sky appears to be white with black stars. Crystals made of information are occasionally found here. They are often made into trinkets that have bonuses to intelligence and wisdom. The second layer is a blue desert, with a completely black sky. The third layer is unknown.
Creatures:
Divine Lettters: The most famous of these is O from Planescape Torment. They are embodiments of letters from the Divine Language. These creatures appear to be humans, "wrapped" around a great light. They grow more powerful and intelligent the more of them there are, similar to cranium rats. It is said that if all of the Divine Letters are gathered, they would become omnipotent. They are named after letters from various languages. They can naturally speak all languages.
Relen: These creatures are humanoids, with grey exoskeletons and no face. They are extremely curious, always seeking to learn more about any subject. Many Relen join the Sensates or the Guvners, depending if they are more curious about the multiverse or it's laws.
Not sure I like an Ordial Plane with "often made" magic items and races that commonly join one faction or another. The plane is supposed to be mysterious, elusive, and inaccessible or near to it in most of what I've read. This write-up seems to make it a little too "mundane," if such a word can apply in the planes.