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Set in a fictional universe, often (but not always) with fantastic or supernatural elements, alternate worlds, magic and monsters.

"Old School Renaissance" or "Old School Revival." Tabletop RPGs that are inspired by the early tabletop RPGs of the 1970s

Self-published, small-circulation booklets of original and appropriated texts and images on controversial or niche topics in unpolished or unusual layouts, or some combination of some of that, maybe.