The building had an air of silent malevolence, like a puffed, venomous mushroom; it was obviously modern, but its sloppy, rounded, ineptly unspecific lines made it look like a primitive structure unearthed in the heart of the jungle, devoted to some secret rites of savagery.
There are no more uses of "venom" in the book.
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It was a cobra, whose venom could kill a person in minutes.
Paulo Coelho -- The Alchemist
I used elder python venom, straight from the depths of Tartarus.