Source: Plane Shift - Amonkhet

• Ability Score Increase. 
• Choose one of :
  A) Chose any 2+ , choose any other +1 , B) Choose any +1, Other +1 , Choose any other +1

• Age. Like humans, naga reach adulthood in their late teens. They show no signs of aging beyond that point except for growing larger, so in theory, a naga could live well over a century.

• Alignment. Most naga are either neutral or neutral evil in alignment.

• Size. Naga stand about 5 feet tall when upright, but the total length of their bodies, head to tail, ranges from 10 to as much as 20 feet. Your size is Medium.

• Speed. Your base walking speed is 30 feet.

• Speed Burst. By lowering your body to the ground and propelling yourself with your arms, you can move more quickly for a time. As a bonus action on your turn, if you have both hands free, you can increase your walking speed by 10 feet until the end of your turn.

• Natural Weapons. Your fanged maw and constricting serpentine body are natural weapons, which you can use to make unarmed strikes.
  • Fanged Maw - 
  • If you hit with your bite, you deal piercing damage equal to 1d4 + your Strength modifier, and your target must make a Constitution saving throw (DC 8 + your proficiency bonus + your Constitution modifier). On a failed save, the target takes 1d4 poison damage.
  • Constricting Serpentine Body - 
    • If you hit with your constrict attack, you deal bludgeoning damage equal to 1d6 + your Dexterity modifier to try to catch enemy to grapple (escape DC 8 + your proficiency bonus + your Strength modifier, if you want prevent enemy from escape roll 1d6 + Strenght modifier). Until this grapple ends, the target is restrained, and you can’t constrict another target.

• Poison Immunity. You have resist to poison damage.

• Poison Affinity. You gain proficiency with the poisoner’s kit.

• Languages. You can speak, read, and write Common and Naga.