Assassin's Poison

If you drink it, you take 3d6 poison damage, and you must succeed on a DC 15 Constitution saving throw or be poisoned. At the start of each of your turns while you are poisoned in this way, you take 3d6 poison damage. At the end of each of your turns, you can repeat the saving throw. On a successful save, you can shake off the effects of the poison but take half damage from it. 

Notes: Consumable, Cursed