Thranduil the Elvenking has invited you to visit his halls in the northern reaches of Eryn Lasgalen, where he believes you may find news of Karazgar, the Weeping Warrior.
'You say the Orcs sought Karazgar at Dol Guldur? Yes, the Weeping Warrior is known to me, for he has troubled my people for many years. He is a dragon-tamer, sly and cruel. I long suspected he had some part in rousing Smaug the Golden from his lair in the Ered Mithrin, but lacked the proof of it. Smaug is long dead, but Karazgar remains, a constant thorn in the side of my people and others in the North. I would be glad to see him slain, but he is elusive.
'Neither have I heard of this artifact Bugdatish. A number of relics from Dol Guldur will be brought back to Felegoth for cleansing and for study. One of these may prove the artifact you seek. You are welcome to journey north with us to Felegoth. There is a horse here on the Hill of Ruin that will bear you swiftly to Eryn Lasgalen. When you arrive at Tham Taerdol in the Green Mountains, travel north-east through the trees. You will find my halls in the caverns beneath the hill of Cerin Dorn. My son also journeys home and will be pleased to see you there.'
Felegoth, the Halls of the Elvenking, can be found in the north-eastern woods of Eryn Lasgalen.
The steed near King Thranduil outside the ruins of Dol Guldur can take you to Eryn Lasgalen with utmost speed.
You have come to Felegoth, the Halls of the Elvenking, and should make yourself known to Limlang, the guard at the entrance.
King Thranduil is at his throne in the north-eastern chamber of Felegoth.
Legolas invited you to visit the dining chamber, the Room of Study, and the water-way bridge in Felegoth, and to speak to the Elves you find at those locations.