Kill the 4 a Quellithulian portal mage (66^^^) to summon The Messenger of El'Arad (67^^^)
Kill the Messenger of El'Arad to open the portal.
Take portal to the Palisaid of the Flamelord
Clear zone to activate the two Sphere of Teleportation (one Up, one Down)
Go Up to The Auditorium and Kill Korgo.
NOTE: You may wish to clear the zone first. When you attack The Arcane Librarian, she will begin to summon all of the mobs in the zone to the fight, as well as adds which will spawn in. They do not all come at once, but in waves.
Examine the book on a desk at the north end of the room Korgo is in ( 170, 57, -33 ) .