This quest is not available in game.
Open the Resonite cask with the Enchanted Resonite Crystal, and then slay Goggeroc. Return to Mor'rogal with the news and Enchanted Resonite Crystal.
You have uncovered a dark threat to the land, <class>. The Resonite cask you have found in that cave houses a slumbering Earthen by the name of Goggeroc.
I have changed the mixture of the Resonite crystals that you gathered with my shamanistic powers. Take the enchanted Resonite crystal and smash open the Resonite cask, which houses the Earthen.
When awakened, Goggeroc will be weakened... Slay him, <name>!