Book Search.

Hello /book/, I am looking for a book name I have read once but the only thing I remember from it, in somewhat a foggy manner, is its plot.
/r/ name of the book, thanks in advance /book/.
The book had a bit of chinese folklore feel to it. Since the main charcters of the book were deamons who were defeated by angles and were exiled to a desert-like-realm in which their "Ch'i" becomes really low and they remain there weak and imobilized.
The deamons had an objective which was to break free from their desert-prison-realm and revange the angles who exiled them.
By taking the human technique of "Feng shui" from the human world and apply it on their desert-like-realm they turn it into a prosper green and full of "Ch'i" realm and once again become really powerful and if i remember correctly in the end they go to fight the angles and break free/find a way out of their realm (since it's no longer desert in the end).
I also remember that there was protagonist who was a potter deamon and the vases he made were magical and you could enter them and they were like little realms and that oe vase made one of your wishes come true.

It's the unpublished/unfinished novel by Roger Zelazni. I think it was called "Lord Demon" or something. It was posthumously published in 1995, I believe. It wasn't particularly good, but not bad either. Quite entertaining in a special Zelazni way.