Caranost is still controlled by Orc forces. After efforts to rid them have continued to fail, it is apparent that there is a greater force at work therein. You are tasked with scaling to the greatest height of the ruins to discover and dispatch the true leader of the forces there.
'${PLAYER}, it is clear now that the battles within the ruins of Caranost are not against simple Orcs or their lesser cousins. There must be a truly vile force leading them for their resolve to remain so steadfast in the face of our continued assault. If you are willing, we are asking anyone with the gumption to assist to track down the leader at the very crest of the ancient ruin and bring the enemy low -- at last.'
Speak with the mission giver to make a final assault on the crown of Caranost.
After defeating the Uruk-hai leader in the fortress at Caranost you should return to the mission giver and let them know what you have learned.