When you say you've been all around elevators it sounds like you made it already to the elevator maze. You should be able to find a lever there, and pulling it should finally give you access to a corridor that drops you down to the serpent master, whom you'll get the key from. There is a map here[url] which might help, but it didn't match with the map I drew. Could you let me know if that map works for you?
Good luck
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