Venom

 When you cast this spell your bite now packs a poisonous punch. If you don't have any already, you grow a pair of fangs that can be used to make unarmed strikes. On a hit, the target of your bite takes an additional 1d6 poison damage. If this attack would reduce the target to 0 hit points, the target is stable but Poisoned for 1 hour, even after regaining hit points, and is Paralyzed while poisoned in this way
Additionally, whenever you make an attack with your bite that hits, you can choose to add an additional 2d6 poison damage to the damage roll and force the target to make a Constitution saving throw. On a failure, the target is Poisoned until the end of your next turn. Doing so ends the spell.