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Q&A Deadly, Heavier than Air Gas

In a given fantasy world, I need a deadly (yet not magical) gas that will naturally pool in low depressions and valleys. The level of magic is not high, so I'd like it to be an actual chemical tha...

17 answers  ·  posted 9y ago by Danny Reagan‭  ·  last activity 5y ago by Danny Reagan‭

Question gas