Try looking at all the previous messages posted on the board that have to do with the serpent temple.

There is one there that gives you a complete walk-through for the serpent temple....

Good luck =)

The book answers the questions the Naga spirt will ask when summoned. If you talked to the imprisioned theif he will tell you what is needed to raise the spirit in the room with the large snake door and brazier/firepit. IF not I will include spoiler below.
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Use
inscence
spider nector (you have to make in another room in temple)
runed wand