You have journeyed into the Tomb of Elendil in search of the Silithar needed to reforge Narsil.
Idella Crypt-breaker is somewhere within the depths of the tomb of Elendil.
Calenglad was right -- Idella Crypt-breaker's gang of tomb-robbers has taken advantage of the newly-lowered waters to plumb the depths of the tomb for treasure. She must be stopped.
Gwindeth has come to the Tomb of Elendil, and is waiting to speak with you in its deepest chamber.
You have dispatched Idella Crypt-breaker, but there is no sign of the Silithar.
The Silithar is somewhere in the caverns beneath the tomb of Elendil.
You did not find the Silithar in the final chamber of the tomb of Elendil -- it must have been carried somewhere by the retreating waters.
Gwindeth is now in the cave beneath the tomb of Elendil.
You have recovered the Silithar, and Gwindeth waits to speak with you.