Coruwen has noticed the corruption of the surrounding plant life. Help her drive it back.
'Are you the one who helped Nuddo? We have both been working tirelessly to combat the spread. I found myself here in the Stoor-vales in my travels through Eregion. It was this very shadow that led me here, and that has kept me here.
'If you could help me, perhaps I could create a draught that could ease the pain on the land. I will first need samples of the blighted plant life. The corruption is strongest in the dark nest Cobshollow.
'Travel to Cobshollow and find samples of the corrupted plant life... but be cautious! What lurks within is dark and twisted.'
Coruwen has asked you to travel to Cobshollow to the south of Lintrev to collect samples of corrupted plant life.
Coruwen has asked you to grind the corrupted samples into a powder.
Coruwen's mortar and pestle can be found nearby, next to her work table in Lintrev.
Coruwen instructs you on how to mix the ingredients in the mixing bowl by her work table in Lintrev.
Coruwen has asked you to mix the samples in with the ingredients she has prepared.
The mixing bowl can be found near Coruwen in Lintrev.
The cleansing draught seems to be complete. Bring it to Coruwen in Lintrev.
Coruwen has asked you to spread the cleansing draught along a running water source.
She has suggested a waterfall to the south of Lintrev that runs into the Wadewater. The people of Stoor-vales often use this watering spot. You should look for their items.
The cleansing solution has been poured into a water source that runs into the Wadewater. This should help with the shadow's corruption for now.
Coruwen can be found in Lintrev. You should tell her the deed is done.