Alphlanc is watching the road as it runs over the Last Bridge for any sign that servants of the Enemy might slip into -- or out of -- the Trollshaws.
'I bid you welcome, friend, but must give you a word of caution: servants of the Enemy passed across the Last Bridge and swept into the Trollshaws no less than two months ago, pursuing a small company. They were hindered at the Ford of Bruinen, and the good people were brought to safety, but... not all of the evil ones were accounted for.
'Barachen maintains a camp to the east, on a hill south of the road. Bring him this message from me, if you are going that way: \qNo agents of evil have entered the Trollshaws by the Last Bridge, but so too have none left it. Whatever evil lurks among the ruins of old Rhudaur... remains there.
'I thank you for this, friend. Tread with care and follow the road east until you find the marker we placed to guide friends to Barachen's camp. It is difficult to miss, for it is white, unlike the stone of these hills.'
The Elves placed a white marker stone along the road to guide friends towards Barachen's camp.
Alphlanc told you to seek a white marker stone eastward along the road.
Barachen is at his camp east of the Last Bridge, on a hill south of the road.
Alphlanc asked you to bring word to Barachen that no evil has entered the Trollshaws while she has been watching the Last Bridge, though neither has any left.