I'm currently on book three of the amazing fantasy series
Lyonesse by Jack Vance which is absolutely brilliant. I haven't read a series this engrossing . . . well, ever.
I'm bad at summarizing books, so you can read summaries and reviews of each title on Goodreads, etc.:

Book one -
Suldrun's Garden
Book two -
The Green Pearl
Book three -
MadoucI can honestly say that what I've read so far is better than
Dune which is one of my favorite sci-fi books.
There are currently hardback and softcover omnibuses of this trilogy which I recommend getting ASAP before the book is out-of-print again. The titles in this book are generally out-of-print and you're usually forced to have to buy used out-of-print copies from used book stores if you want this. You could, of course, purchase volumes in the series second-hand, but you likely won't find it in local bookstores; used copies of the books in this series aren't always easy to find and can be pricey.
I'm creating this post so that you folks can acknowledge the existence of this series; it's strongly deserving of attention. It's a shame that it's obscure and often out-of-print.
Consider checking it out. If you're into speculative fiction, this could very well become one of your favorite series of all-time. Heck - even if you're not into speculative fiction you could enjoy this. Lots of people who've read this say that this is on par (or even better) than
Lord of the Rings.