Suggested Players 
There's no reason to suspect Dammia's words are anything but true. Whether Grom'thar defeats you or is defeated by you, she can wash her hands of this.
Follow her instructions... take the horn that you brought me earlier, travel to the ring of torches south of the Azure Dragonshrine, and blow it to announce your challenge.
When Grom'thar the Thunderbringer arrives, kill him and bring me his head.
Did you end this threat for good?
You are formidable indeed.
With Grom'thar the Thunderbringer gone, we can leave the remaining Magnataur to fight among themselves and turn our attentions back to more prominent threats.
Impressive work, <class>.