Jade is a relatively low-level world which contains player characters of upto 9th level. It is cut-off from the rest of the AD&D Multiverse by a supposedly impenetrable barrier. Jade has its own History, Religion and a few minor Rules Modifications. If you fancy running your own adventures in Jade, feel free. There is a whole world out there and much of it remains relatively unexplored. If you do detail any new areas, let me have it and I'll try to merge it in with what I've already got.
Jade started as a joint project with a friend of mine from University, many, many years ago. We even thought we could make a living at it, publishing guides and adventures. Perhaps we could have if we had not drifted into easier, more normal careers. Then again, if I did AD&D for a living maybe I wouldn't still be enjoying it as much as I do.