Find the Sacred Highborne Writings in the Temple of Zin-Malor in Azshara, and bring them to Aurora Skycaller near the Northpass Tower in Eastern Plaguelands.
I did not realize... Forgive my callous words, [class].
The mistakes of my ancestors are not what I wish to dwell on, but if your request is truly genuine, then I will help you.
<Aurora examines the fragments.>
I believe this is the Crystal of Zin-Malor, an artifact that can contain and control strong arcane forces. It could have been used for good, but the evil intentions of those that stole it caused it to shatter.
Go to the Temple of Zin-Malor in Azshara - I can only hope the book is still there.