Thórvilon has enlisted your help to protect Vartúlin and the Kintai from the encroaching darkness that threatens Imhûlar.
'The protective arts with which we ward our groves have become less effective over time, but it is the hope of the Kintai that they will forestall the encroaching darkness long enough for us to discover a lasting solution. We have inscribed runes of guarding and renewal upon boundary stones that must be placed along the perimeter of Vartúlin.
'Will you retrieve some of the boundary stones from the pile across the bridge and set them along the borders of the grove? I will remain with Silirtas until she returns to herself.'
A pile of the boundary stones can be found across the bridge in Vartúlin.
Thórvilon has asked you to place boundary stones around the edges of Vartúlin.
That should be enough stones to fulfil Thórvilon's request.
Having satisfied Thórvilon's request, you should return to the centre of Vartúlin and check on Silirtas.
Sigileth wants to rejoin the rest of your travelling company at Kûr Anzar, to the north of Vartúlin.
You should defeat some of the Dead that lurk at Adakûr before they threaten the folk that live in Imhûlar.
Sigileth wants you to look at Kûr Anzar from a location to the north-east and determine the situation inside the city.