1) I'm not sure I know which wooden door you're referring to. Can you be more specific as to location in the temple (is it close to the Snake Head, the Library, ?)
2) The barred gate leading away from the library is actually the EXIT from the main arena where you find the High Priestess. You'll encounter her after you kill the Naga and solve the Lift Maze puzzle. That's just a quick exit back to the main temple.
3) Kerielle's elixir will put the Naga to sleep temporarily. The only thing I've ever used it for is if one of my characters was turned to stone or about to die; I'd put the Naga to sleep, heal everyone up, then go back to town on her. She wakes up as soon as you swat her again.
-Sazerac
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