Most influential Sci-Fi/Fantasy books for your style

I am running something next week that is just ripped straight from the pages of Dune Messiah (pro GM tip literally no one will notice if you do this). It got me thinking:

What are the books you've read (I'm thinking Sci-Fi/Fantasy but I guess anything) that you feel have had the biggest influence on the way your games run?

For example: I wouldn't say they're my favorites, but the old REH Conan pulp stories have had an outsized impact on how I run games. I love the mystery of the wilderness and the idea that magic is ancient and dangerous, and I love that the action is usually driven forward because Conan is trying to steal something or kill someone, and not because the action finds him and he gets wrapped up in it.

What comes to mind when you think about SF/F books and the way you play and run your games?

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