The Shadowbark Huorns are defeated, but the darkness that twisted them is still a mystery.
'Hoom, hum. I have spoken with the trees and am troubled anew. They speak of poisoned roots, foul waters, and a silver-barked Huorn called, hummm, how to say it in your speech - the Wicked Holm. Take you this rotten bark and burn it on the hill nearby. I suspect the scent of the smoke will draw out the source of the poisoned shadows.
'Go carefully, my little friend, room-tum. To spread its violence through so many, and so far - I fear the Wicked Holm to be a powerful foe, indeed.'
The Wicked Holm may be summoned by burning the shadow bark atop a hill in the south-western Wildwood.
Thornmane has asked you to defeat the Wicked Holm.
Thornmane is located in southern Wildwood.
You should talk to Thornmane.