Treebane

Treebane is a magical axe, wielded by Evelyn, whose handle is carved with leaves and vines. When it hits a plant, the target takes an extra 1d8 slashing damage. When creatures who are not of good alignment try to wield the axe, it sprouts magical thorns on the handle.

Evelyn found Treebane on episode 15. It was lodged in a tree trunk at Yester Hill.