Worldbuilding - Your Turn! Part III

Been months and I'm bored. Let's talk about random worldbuilding ideas! Past topics include geography/climate (this was pre-map but I got stuff right!), food, language, music and instruments, and marriage and partnership. Since I did all those posts, a new region was revealed (Ixtal), and we've received more details on some others, so feel free to toss me whatever, even if I already talked about it a while ago.
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