This quest is not available in game.
Find General Nazgrim at Domination Point in Krasarang Wilds
After the Council returned from their journey, they passed the knowledge of what they learned to all of the Warlock sects.
However, they disappeared shortly afterwards...
<name>! The tome you possess may be just the thing we need to convince them to join us in our assault against the Alliance!
Find General Nazgrim in Domination Point and convince him of the importance of your mission.