You have pushed your aberrant physiology to new extremes, allowing you to devour your enemies.

Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20.

Swallow. If you or your tailsnake grapples a creature smaller than or equal to your size category, you can force the creature to make a Dexterity saving throw at the start of each of its turns with a save DC equal to 8 + your Constitution modifier + your proficiency bonus, swallowing it whole on a failed save. You can only digest one creature at a time. While you are digesting a creature, your movement speed is halved if the creature is the same size category as you, or reduced by 5 if it is one size category smaller. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside of you, and it takes acid damage equal to 1d4 times your character level at the start of each of your turns. Additionally, you gain temporary hit points equal to your character level at the start of each of your turns. If you take damage equal to twice your character level from the creature inside of you, you must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate the creature, which falls prone in a space within 5 feet of you.