I read a ton of nonfiction, but I'll focus on the relevant fiction novels that I think will be of interest.
I recently started reading Perdido Street Station, which like this game has an enchanting combination of strange, unknowable magical forces, and very down-to-earth and believably mundane subject matter.
A Long Way to a Small, Angry Planet seems to be a slice-of-life science fiction book, something I think there is nowhere near enough of.
Ringworld has one of the archetypal sci-fi megastructures. I guess it's a kind of expression of the sort of grandeur/sublimity one might feel in seeing Uluru or Mount Everest, these things.
Terry Pratchett's Discworld series is indescribable.
The Cartoon History of the Universe manages to be very light-hearted and hilarious despite being very candid about the sheer number of atrocities going on.
Expedition by Wayne Barlowe has excellent creature designs and haunting paintings.
Shadowsword is set in the violent and dramatic Warhammer 40k universe, but in the first few hundred pages it resembles Western Front WWII stories such as Saving Private Ryan more than anything else. It's something I enjoy very much, works that feel both otherworldly and historically grounded in the past.
I'm planning to read Machiavelli's The Prince, Zen and the Art of Motorcycle Maintenance, and The Sellout by Paul Beatty.