Travel to the northern borders of the Eastern Plaguelands and recover the Quel'Thalas Registry. The item is somewhere in the Quel'Lithien lodge. You must also slay 8 Rangers, 8 Pathstriders, and 8 Woodsmen.
The high elves of the Quel'Lithien lodge possesses something that belongs to me, [class]: A document detailing my life as a mortal.
Before you ask; no, you most certainly are not privy to such information. Just do as I tell you, worm: Recover the registry.
And imbecile, be sure to leave as much strife and grief as possible in your wake. Leave them suffering...