Because I'm toying with another fantasy novel idea, but, just like my first one, it features a peoples of the desert that develops a barbaric culture to match the unforgiving nature of their environment. There's a small but really cool twist reliant on that culture, but the orcs in my main fantasy saga are sadistic carnivores originally from the desert too.
Probably won't find any help here, but I'm just outlouding.
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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.