Threkmóth and his folk have taken the poison-protecting potion in preparation for the assault on the Ungoledain... and possible rescue of Vaskorn.
The Ungoledain appear to be ready for an attack. Fight them off as you continue to search for Vaskorn.
Vaskorn appears to be unconscious, but alive.
The Ungoledain have begun to retreat, but left behind a vicious spider shade to fight you.