was able to follow the instructions I gave him, which would return me to a rudimentary, weak body of my own, a body I would be able to inhabit while awaiting the essential ingredients for true rebirth a spell or two of my own invention a little help from my dear Nagini," Voldemorts red eyes fell upon the continually circling snake, "a potion concocted from unicorn blood, and the snake venom Nagini provided I was soon returned to an almost human form, and strong enough to travel.
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.