This quest is not available in game.
Slay the Raven God and return to Morthis Whisperwing at Cenarion Refuge.
This quest must be completed in Heroic dungeon difficulty.
We must waste no time in dealing with the raven god. You must take the essence-infused moonstone to a place of great power in order to lure the god from the relative safety of the Emerald Dream.
Descend into the Sethekk Halls and set the moonstone in the clutches of the raven's claw. You'll find it in the chamber before the talon king's hall.
Anzu must be made believe that his followers have gathered to welcome him back into the world. Once he has manifested, show him no mercy!