Pit of the Red Mummy
The artifact you seek lies in the tomb of Gazeahl the Red, but do not seek it in his sarcophagus. Better that what lies there rest undisturbed. Seek rather the mausoleum of his three celebrated servants. There it lies for certain.
What? You want to know which of the three holds it? How the hell am I supposed to know? Go try your luck, just don't blame me if you awaken something you wish you hadn't.