NOTE: There are many similar book quests in the Obelisk of Lost Souls zone. Each one grants additional AA experience. Each one has 10 entries. So you know how far you are along in the quest. Often the last 3 entries request the same mob over and over, so don't clear a room of them before you read the book. This particular book is "harder" than the others because it requires mobs only found on the deepest level, and it rewards more experience than some of the others.