This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Return to the Scholomance with the Blood of Innocents. Find the porch and place the Blood of Innocents in the brazier. Kirtonos will come to feast upon your soul.
Fight valiantly, do not give an inch! Destroy Kirtonos and return to Eva Sarkhoff.
With the death of Kirtonos, a chapter in the horrible tale of Scholomance comes to a close. There is, however, more to be done. Others here are now aware of your brave acts. Take this, <name>. It is a piece of our own essence. It will allow you to communicate with the other lost souls of Caer Darrow.