Wreath of the Dying Grove

This floral wreath is woven from the branches and leaves of ancient trees, pulsating with a soft green hue that seems to ebb and flow with life. While wearing the Wreath of the Dying Grove, you gain advantage on saving throws against being charmed or frightened. Additionally, once per short or long rest, you can use an action to create a burst of necrotic energy in a 10-foot radius centered on yourself. Each creature of your choice in that area must make a Constitution saving throw against your spell save DC, taking 2d6 necrotic damage on a failed save, or half as much damage on a successful one. Allies within the area regain hit points equal to the amount of necrotic damage dealt. If you use this feature, you cannot use it again until you complete a long rest.