Book of the Ancients

The Book of the Ancients is guarded by Lord Kragaru on the Ranazjar Isle in Desolace, the book contains a plethora of secrets about the naga - secrets that have been kept for many centuries. According to Azore Aldamort after players complete a quest involving the retrivement of the book, it will be passed on to the high council of Argent Dawn at the first opportunity.

Source
This item drops from Lord Kragaru on the Ranazjar Isle in Desolace.