Years ago, my sister and I lived happily in the woods. Then the Ward was breached. I fought the rifts while my sister bent them to her will. Twisted by death energy, she blamed the people of Gloamwood when I died, rather than the power of Regulos.
This curse has the feel of her work, but we must learn more.
This Hag's Diary explains much about what has been occurring in the wood. It appears there is only one way of dealing with this evil taint, but to see it done, your conviction must be strong.