Some of the scouts have been poisoned by the Angmarim and require an antidote.
The grizzled, old healer squints at you. After a brief pause, he nods in approval.
'I can see that you're no stranger to war. Might need your help. The Angmarim at Dûn Traikh administered poison to their prisoners, like Einar here. Can't craft an antidote 'til I get a hold of the poison itself.
'Head west to Dûn Traikh. A few Angmarim there may be carrying phials of the poison.'
Dûn Traikh is located west of Drenghól.
You may find phials of the poison by defeating Angmarim there.
You have found several phials of the Angmarims' poison.
You should deliver the phials to Thrúthug at Drenghól so that he can create an antidote.