I've been reading Science Fiction/Fantasy since I was a kid, and this book is one of my all time favourites.
Following an unfortunate run in with the Na'id galactic empire, the survivors of a rebel ship crash land on the mythical planet Iry, populated by slightly alien Itiri Warrior Priest with familiars, "double curved tungsten plastic" swords, and the remnants of a long lost technology. Cue plenty of strange rituals, past history of some of the main plot characters coming back to haunt them, a few surprises along the way, and a dramatic final standoff.
I've got the hardback version of this book, bought back in late 1980's from Lears Bargain Book Shop in Cardiff. Every few years I'll get it out and read it again. Even though I obviously know the story, I still enjoy it every time.
I wish they'd Kindle it so I can add it to my electronic library.