Krasus's Compendium

According to Archmage Vargoth, this book was a compilation of all the spells Krasus, the high elf guise of Korialstrasz, mastered and learned over his years as a mage of Kirin Tor.
You may be looking for one of the following:
*Krasus's Compendium - Chapter 1,
*Krasus's Compendium - Chapter 2, or
*Krasus's Compendium - Chapter 3
===Sources===
1. http://wow.allakhazam.com/db/quest.html?wquest=10192