Yuan-ti Malison

Str or Dex +1

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, except your snake form’s AC is equal to 13 + your Dexterity modifier. Any equipment you are wearing or carrying isn't transformed. While transformed, your fanged mouth is a natural weapon, which you can use to make unarmed strikes. If you hit with it you deal 1d4 piercing damage and the creature must make a Constitution saving throw or take 2d4 poison damage. The damage increases to 3d4 at 6th level, 4d4 at 11th level, and 5d4 at 16th level. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. You cannot speak or cast spells while transformed.

You are a humanoid snake hybrid, and it is immediately clear to anyone who sees you. Each feature grants you a different bonus. Your snake-like feature is one of the following types:

• Type 1: Human body with snake head. You do not have to be transformed to use your natural weapon, but if you are not transformed the poison deals half damage.
• Type 2: Human head and upper body with a serpentine lower body instead of legs. Your walking speed increases by 5 feet. You may use your tail to grapple a creature without requiring a free hand.
• Type 3: Human head and body with snakes for arms. You do not have to be transformed to make unarmed strikes with your natural weapons, but if you are not transformed the unarmed strikes do not apply poison. If you are grappling a creature you may use your bonus action to make an attack using your natural weapon against that creature. Your snake arms impose disadvantage on your sleight of hand checks.