Mithrandir has studied the artifact that Ayorzén stole from the vault of Durthang and believes that if it might be cleansed of its corruption it could be empowered with a force for Good.
'I have studied the artifact that Ayorzén stole from the vault of Durthang. It bears a powerful corruption, but it was not made in the land of Mordor. It came from elsewhere, and the corruption that envelops it stems from its long stay in the Black Land. If this evil could be cleansed, I believe that Elrond could imbue it with a powerful and vital force for Good.
'Before that can happen, however, we must do something about the corruption that Mordor has worked upon it. There are different methods to accomplish this, though the Wise disagree upon the effectiveness of each. My preferred means for such a cure is to bring the corrupted item to the place where it was made, or to places of some significance upon its path, and to thereby diffuse the foul touch of Mordor that has, in the interim, claimed it. We must learn the story of this heirloom before it came to Mordor.'
The Wizard turns the artifact over in his hands, studying it for some clue to its origin. To your eye the heirloom is a small sculpture carved from stone, in the shape of a squat humanoid figure.
'This carving is very similar in shape to the Púkel-men that guard the road to Dunharrow, in Rohan, but I have never seen one carved so small. It is said that those figures are carved in the likenesses of the Drúedain, the Woses, the Wild Men, and the forest in Taur Drúadan is home to similar statues of enormous size.
'If this is so, perhaps the Woses will be able to tell you from where this sculpture came, and aid in the cleansing of its evil. But take heed! They hate Orcs and everything touched by Orcs, and may not receive you kindly if they deem that heirloom has been ruined by Mordor and is beyond saving.'
Ghân-buri-Ghân is the leader of the Drúedain and may know the origins of the corrupted carving. He is at Drû Bhûta, in Taur Drúadan.
Khôr-buri-Ghân is at the Blood-cloak, east of the great waterfall in Drû Bhûta, atop a large rocky cliff. It is the location where the Wild Men perform their funerary rites.
Khôr-buri-Ghân suggested that you look for Orcs at two places in Taur Drúadan, forth of Drû Bhûta and further north-east of there, in the woods.
Khôr-buri-Ghân suggested that you look for Orcs at another place in Taur Drúadan, north-west over a hill.
Khôr-buri-Ghân has remembered a cave that his brother told him about and wants to find it. He is by the island in the river, waiting for you to speak with him.
Elrond is at the Haven of Orladion in Rivendell, north-west of the Last Homely House.
You have cleansed the corruption from the Memento of Bhai-buri-Ghân, and should bring it now to Elrond in Rivendell.