Speak with Lord Herne at Heart of the Forest in Ardenweald.
In my youth, I was mentored by a wise and powerful Thornspeaker named Kivarr. She passed from this world long ago, but her soul may yet rest within the Shadowlands.
Kivarr's knowledge is ancient and vast, far eclipsing my own. She may be able to offer you the guidance that I cannot.
Seek her out. Deliver the fetish to her. She will know what to do.
May the wind be your guide.