The Banshee of Durlanwood

On their way back to the Heroes Guild the heroes hear a scream from the woods. They decide to investigate and head into the forest. The further they explore the darker and foggier their surroundings het. Eventually they come across a giant beast, mimicking the sound of a girl in distress. They are attacked and quickly ambushes by an evil spirit, capable of knocking out most of the party with their wail. Eventually the heroes defeat both monsters and leave the forest.