Excerpt from "A Dissertation on the Realms," by H.R.M. Thansor.
Chapter 17, introduction. "The most recently discovered of all the realms, Nothingor is the realm that we by far know the least about. In fact, if any other realms are ever discovered, it will undoubtedly be placed in the realm order prior to Nothingor, simply because, if we knew any less about the realm, we wouldn't know it existed at all.
When the Wizarding Academy was first founded, human scholars scoured as many ancient ruins as they could find, trying to find artifacts and ancient writings to popular the fast archive rooms that they built. Perhaps that was a bit lofty of them, but their enthusiasm can hardly be faulted. In the process of this search, deep in a cave in the Vamsick Desert, a large crystal was discovered. A light pink color, about five feet long and three feet thick, it was mistaken for a diamond and given the name Nothingor as a joke. The thought was that, despite the fact that it was likely worth a fortune, no one on the continent would be able to afford it, and thus, it was worth nothing. The crystal was brought back to the academy, where it was studied for a short time before being placed into the vault among the countless other artifacts.
It wasn't until a few short years ago, perhaps fifteen, that a particularly intrusive student broke into the archives and tried to steal several ancient, magical artifacts. His quest was shortened by the fact that, upon stumbling across the Nothingor crystal, he could see swirling images inside it. He turned himself in, and the crystal was drug back out for study. The images, not recorded the first time the crystal was seen, were eventually determined to be reflections from a distant realm.
Many a wizard has sat and stared into the depths of that crystal, trying to figure out the mysterious patterns and images. There are certainly theories, but all that is known for certain is that the reflections are, indeed, from another realm and not simply reflections from somewhere in Calsin. Additionally, the amount of movement is likely associated with some sort of civilization, throngs of people moving back and forth, as they wax and wane similarly to the flow of traffic through a normal city over the course of the day. More than that simply can't be determined, leaving this as one of the greatest mysteries the Realm Mages face to this day."