Twin Fang

Your Mouth Bubbles with a Poisonous Acid. Make a Melee spell attack against the target. On a hit, the target takes 2d6 Acid damage immediately and Make a Con save. If Failed Target takes 2d4 Poison damage at the end of each of it's turns for 1 minute. On a Successful save Target Takes Half Poison damage and Damage doesn't Linger.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage (both initial and later) increases by 1d4 for each slot level above 2nd.