'You have decided to help me? Excellent. There is a draught I know the making of that should cleanse the taint from the ruins of Dol Ringwest. I have most of the ingredients I need, but there is one remaining herb -- a fragrant herb that grows on the shores of the river, a short way north of here.
'Tis a simple matter to gather it, and I would do so myself, but the brewing is at a delicate stage right now, and I must keep a close eye upon it. Would you gather the herbs I need, (your name)?'
Calengil has asked you to retrieve the herbs that he needs to complete the cleansing draught.
Collect fragrant herbs
The herbs can be found along the riverside a little ways north of Duillond.