Potion of Poison

If you drink it, you take 3d6 poison damage, and
you must succeed on a DC 13 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,the poison damage you take on
your subsequent turns decreases by 1d6. The
poison ends when the damage decreases to 0.This
potion looks, smells, and tastes like a Potion of
Healing with illus