Due to your snakelike origin, you have immunity to poison damage and are immune to being poisoned.

You can use your action to polymorph into a Medium snake or back into your true form. Your statistics are the same in each form. Any equipment you are wearing or carrying isn't transformed. You don't change form if you die. 

Your Constitution score increases by 2, and your Strength score increases by 1.

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage plus 7 (2d6) poison damage. 

As you grow older, you draw closer to a snake god of your choosing. 

You gain proficiency in one of your choosing. Stealth, Deception, Intimidation, or Perception