Tûm, a mystic of the Algraig clans known as a Derudh, told you of an old woman who plies the waters of the river. He believes this crone may know more about the spirits they call the Forest Lords than any other.
Tûm suggested you find the old woman who plies the river of the Mournshaws. It is possible that she knows something of the Forest Lords.
The River-woman has offered you passage along the river's length if you can bring her the teeth of the Cun Annun that haunt the forest in the Mournshaws.
You should return to the River-woman with the Cun Annun teeth that you have collected.