Use Rexxar's Battle Horn at the Altar of Goc, then kill Goc.
Now it comes to this. We will bring Goc forth from his lair, and we will destroy him. With Goc dead, the Bladespire ogres will threaten the Mok'Nathal no longer. Go to Goc's altar outside Gruul's Lair, then blow my horn. I will come, and we will face the son of Gruul together.
Only through the deaths of Goc and Gorgrom the Dragon-Eater will we free the Mok'Nathal.
The battle was hard and you fought well, <name>. I am honored to have stood by your side in the battle against Goc. I am thankful beyond words.
The Mok'Nathal should know of these great defeats, but I am not ready to face them yet. I know my father's mind, and I know my heart. There is still much I can learn and do to become stronger, to show to him that I am his true son.
You will be able to choose one of these rewards:
You will also receive:
Upon completion of this quest you will gain: