The first quest in a series, starting from which is dropped by Talonpriest Ishaal.
You must have completed the quest and have the buff active to be able to see the talonpriest. Talonpriest Ishaal is located at 69,77 on one of the platformed buildings.
This mysterious tome was on Talonpriest Ishaal's body. It contains arcane symbols and charts of celestial bodies beyond your comprehension.
What have you brought to me? I can't make out the writing on this tome, <name>... my loss of blood... must've blurred my vision.
This is part of the the Terokk's Downfall quest chain.