For those who haven't read this great series of books by Margaret Weiss and Tracey Hickman, I'll give a brief overview, I'll try not to give any spoilers.
This is a world heavily laden with magic. There are dragons, humans, elves, dwarves and even animated dead and resurrection here..
Magic is largely rune/sigil and verbally based.
Everyone is on some quest of to exercise power over others or to have some degree of control. This all bumps together in an "end of times" direction.
Right up front, there is so much about this book series that just begs to be used as a campaign world for AD&D 1E to be dropped into.
There are three general "Classes" of magic user in this series. Low level magic users, Sartan/Patryns and then a very high level magic user class.
They all essentially use the same magic forces but based on their level of advancement and form of practice, it is used at remarkably different effectiveness.
With some minor tweaks, I personally think that this world could accommodate 1E just fine. Personally, I am inclined to stay away from the primary story line and characters. I tend to branch away at a different point in time and when the primary characters are no longer really able to be interacted with.
I don't think will be hard to do with this series. One could take the stage settings but discard the storyline entirely.
I may very well try to do this in the near future.