The Valley of the Damned

From publisher blurb: This is an OSRIC adventure for characters of 10th to 13th level of experience. The players learn of an important recent discovery. A long lost artifact was lost in the mountains nearly one hundred years ago. Recently a new system of caves has been discovered near where some powerful adventurers who last possessed this artifact were lost. Other adventurers are looking for this artifact as well so time is of the essence.