Dragon's Tail

You grow a tail that can be used in combat. As an attack, if you have more than one, treat this as a single attack, you make an melee attack against a creature within 5ft of you. On a hit you deal 2d6 bludgeoning damage. Additionally, as an action you can spin in a circle and force every Medium creature that can be knocked prone to succeed a Dexterity saving throw or be knocked prone (DC equal 8 plus Dexterity plus your proficiency bonus). Creatures already prone take 2d6 bludgeoning damage. Damage increases to 3d6 at 11th level, and 4d6 at 17th level.