http://www.volberding.com/Whints/
Go to text walkthroughs and or graphic walkthroughs.
I was clueless throughout this whole area, LOL...having to rely on memory to get out of where I had been before and where I had not!
The only real hint I can offer you is not to kill The Serpent Master until you answer his questions ("Yes" and "None") and get a key from him. The key opens up the treasue room near where you fought the Naga and gets you to Elyssia and the Masque of Death (The BEST fight of the game!)
The treasure room has The Tome of Fire in it in case you are collecting them for ascending to Zenmaster.
: )
Moni