Gormenghast
The Queue: I like older fantasy
Since Alex used The Queue to recommend a fantasy novel series, I’ll do so as well.
The Gormenghast series. Three books by Mervyn Peake. If nothing else, try Titus Groan first, see if you like it.
I could recommend more — a lot more, really — but I’m here to answer your questions about Blizzard games, not just recommend books all day. (Mother London by Michael Moorcock, get it.)