I have the nectar and the incense...where do I go to find the library, scroll of trickery, book of Ardibren, and serpent wand?

Don't know about scroll or book, but library is after the brazier in front of the giant snake head and the serpent wand is in the library.

If you can get yourself to the brazier - the library is: take the right hand path. It leads up to a room with a path going straight and a path going down to your right. Go down, follow the path around either direction and you're in the library. Do you have your monkeys and the snake idols??

Wyv