-  The Footsteps of Dartain: Preparation
-  A Corrosive Influence
-  A Foul and Polluted Place
-  Measures of Containment
-  The Dues of Knowledge
- The minimum level to zone in is 82.
The trickiest part is getting to the final room. Once you defeat the main librarian a red portal will activate on floor taking you to a platform. search for a book to move on the nearby bookshelf. This book will open the secret passage.