'Her sisters are as wide as the world, for each way the water flows there are River-maidens. To call the Red-maid back to nature you shall need to enlist the aid of of the maiden Iarwain Ben-adar's took to wife. Her name is Goldberry.
'The winds tell that she may be found far to the west in a land where Iarwain Ben-adar still dwells. Seek out Goldberry and ask her to cleanse the water so that her sister may heal herself and the land she once loved.'
Dannasen aid that a sister of the Red-maid would need to give mercy to purify the water and provide a chance to redeem the Red-maid.
1. Goldberry dwells in the Old Forest, far to the west of Agamaur.
Dannasen instructed you to present the River-maiden Goldberry with the full Urn of Agamaur and ask her to purify the water within so you might restore the Red-maid.
You should return to Dannasen at the camp and tell him that Goldberry has purified the water from Agamaur with a sister's love.