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Para-elemental: AD&D has long had the traditional four Empedoclean elements as a gameplay element. There's a whole theme park/plane of existence devoted to each element. Then it got silly: they created para-elemental planes where the elemental planes touched. So at the intersection of Fire and Air you got the para-elemental theme park/plane of Smoke. Then it got even sillier with quasi-elemental planes like Salt and Vacuum. Andy and I mocked this trend in one of our ZZT games. But recently (ie. ten minutes ago) I had the idea of using modern materials science to create new para-elemental planes, equally ridiculous but cooler than Smoke:


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