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My personal favorites are Good Omens by Neil Gaiman and Terry Pratchett - it is a satirical take on the Apocalypse and follows the antics of a Demon and Angel stationed on Earth as they try to avert it.
The other is THe Mists of Avalon by Marion Zimmer Bradley, it is a rather long and intense read but it basically goes incredibly in-depth with Arthurian Legend - told mostly from the perspective of Morganne (Morgan).
Third is pretty much any novel in the Vampire Hunter D by Hideyuki Kikuchi, but most especially the first one. It follows a vampire hunter through post apocalyptic turmoil as he hunts down what is left of the vampires after their rule fell and faces his own demons.