Venomous Blood

You send a surge of energy through your body, converting your very blood into a toxic bile. For one minute, your blood becomes a volatile venom, springing forth from your veins in a retributive spray each time you are wounded. Whenever you take damage from any source that is not psychic damage, toxic blood sprays from you, dealing 1d8 poison damage to all creatures within 5 ft. of you.

Additionally, while this spell is active, you gain immunity to poison damage and cannot be poisoned.

A draconic sorcery stemming from the green dragons, whose very blood was lethal to other creatures. Conjuring the power of such a creature is a difficult task for those learning draconic sorceries, and many have found that turning one's blood to poison without proper preparation leads to poor outcomes.