The Huorns of the North Trollshaws have become corrupted by some dark power and have begun working in concert with Wood-trolls and other servants of the Enemy.
'There are more threats in the North Trollshaws than just spiders, ${PLAYER}. Far to the north and east of here is a marsh we call the Gladdalf. Here, Wood-trolls have appeared, dangerous servants of the Enemy. As well, creatures known as Huorns dwell here, which legend tells are related to the Onodrim of old.
'Alas, these Huorns, though always somewhat wild, have been corrupted by some dark power, and they have begun to work in concert with the Wood-trolls. I do not believe that there is any hope left for them.
'If you and your companions would journey to the Gladdalf, the poor creatures there should be put to rest. Will you do this?'
Huorns can be found in the Gladdalf, in the North Trollshaws.
Thoroniel has asked you and your companions to put down the Huorns of the North Trollshaws.
Thoroniel is posted to the south and west of the Gladdalf in the North Trollshaws.
You should return to Thoroniel and let her know that you have done as she has asked.