Envenom

You empower a weapon or armament of your choice with a minor venom. A weapon affected by this spell deals an additional 1d4 poison damage on a hit.

Additionally, creatures that suffer the poison damage must make a Constitution saving throw or be poisoned for the spell's duration; while poisoned in this way, creatures suffer 1d4 poison damage at the beginning of each of their turns. An affected creature can make additional saves at the end of each of their turns, ending the effect on a success.

This spell can be cast on natural weapons such as fangs, claws, and horns.