I think culture may be affected in some ways by it, but idk about barbarism and sadism. I haven't done any specific research or anything, just a thought.
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I figured the desert would turn a people to worshipping hardship, triumph over brutal adversity, and their diet would account for the relative lack of vegetation.
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It would definitely determine their diet, thats for sure. It's fantasy though, so I think whatever you envision would probably work fine
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I like to keep it logical, though. Contradictory, maybe, but that's how I like to world-build.