Many Hands

When you drink this potion you can call upon an ancient and devious spirit known as Many Hands. When you do, a host of long, spindly, spectral arms reach out from your body. Anyone who can see you when the hands first emerge must succeed on a DC 19 Wisdom saving throw or be frightened until the start of your next turn; creatures that are friendly to you have advantage on this save. Additionally, the arms lash out from you, clawing at all other creatures within 20 feet of you. Each creature in that area must make a DC 19 Constitution saving throw. On a failed save, a target takes 10d6 necrotic damage and can't regain hit points until the start of your next turn. On a successful save, the creature takes half as much damage, but suffers no other effect.