Tears of Talona

You can use an action to cure a poisoned creature
or to poison a creature. The tears cannot be used
again until the next dawn.
A creature subjected to it must succeed on a DC
13 constitution saving throw or take 10 (3d6)
poison damage, becoming poisoned. It must
repeat the saving throw at the start of each of its
turns. On each failed save, the creature takes 3
(1d6) poison damage. After three successful saves,
the poison ends.