The Gulthias Staff

The Gulthias Staff is a magic item made from a spongy, black length of wood. When it strikes someone, it can leech hit points from the victim to the wielder. It can also confer short term madness.

On episode 14, Strix grabbed the staff and had a vision of being at Yester Hill. Later, Evelyn chopped up the staff, which caused the many twig blights roaming the winery to disintegrate.