Post-Apocalyptic
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Post-Apocalyptic is a form of Setting Aesthetics that, as its name suggests, takes place in a once-thriving world that was subsequently blown up or otherwise ravaged by massive disasters of some kind or another. It's an extremely popular aesthetic with many different forms, ranging from nuclear war to zombie apocalypse to alien invasion, and has been an amendment to or basis for many different /tg/ related publications.
D20 Apocalypse is literally a book about doing D20 Modern games set in this genre.