'We've but one last hope for learning both what became of the Men of Cardolan and how the Barrow-downs became home to such fell creatures. Unfortunately, the answer lies in the Downs.
'The lore fragments you brought me mention a fortress named Ost Gorthad. The Men of Cardolan took many of those who fell sick to the Plague there. The ruins of that fortress still stand today and if we are fortunate, some lore from those times may be preserved in those ruins!
'If you are willing, return to the Barrow-downs and make your way to the ruins of Ost Gorthad in the south. There, search for an ancient chest, where parchments or scrolls might have survived all these long years.'
In the lore fragments you brought him earlier, Newbold Leafcutter has discovered that the men of Cardolan made a final stand at a fortress in the south of the Barrow-downs.
You may find a chest in the ruins of Ost Gorthad in the south Barrow-downs. Newbold Leafcutter waits for you beyond the High Bridge at the southern end of the Upper Way in Bree.
Newbold Leafcutter has asked you to search the ruins of Ost Gorthad for an ancient chest. He hopes that lore from the Men of Cardolan may have survived the long years since the Great Plague in such a chest. If you find such lore, you should bring it to Newbold.
Take a fellowship of at least 3 or 4 to handle this quest. Once you go near the chest, a rather large group of wights spawn next to you. Not to mention the Noxious Barrow Wights roaming the area.
Skunkwood's Shield OR Dagorcham