I was hoping for something slightly more portable, perhaps fit in a pocket, something you could take into a dungeon crawl. A Rope Trick that lasts, on steroids. Perhaps more square footage floor space, but while I'm thinking the larger the better, I don't have a particular dimension in mind.A Portable Hole, with constant air, hopefully slightly bigger than fitting just an armchair surrounded by circular bookshelves (although now that I say that out loud, that'd not be too bad. Like living at the bottom of a very comfy well.)
Is there a spell or magic item that permanently creates clean air within a space? Not a Bottle of Air, since that does not come out of the bottle unless you put it to your mouth.
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