The One Ring
Egalmir was a descendant of the chroniclers of the royal house of Cardolan. He lived in Arthedain at the time of the last war against Angmar. During his long life he continued the tradition of his family and preserved a wealth of lore, including a great deal of information about the evil spirits that came to infest the Barrow-downs. When the Witch-king seized Fornost in 1974 of the Third Age, Egalmir sealed his family’s records in a hidden vault.
Egalmir died before he could return to Fornost and his notes on where the vault was located, along with hints at the means required to open it, found their way to Rivendell.