Viper

ability score increase: Your Intelligence score increases by 1.

age: Naga mature at a similar rate to their non-naga parent, and may live for upwards of two hundred years, although few ever reach their third century.

alignment: Naga tend toward neutral alignments owing to their habit of living secluded amongst their own kind, although those that do leave the commune often adopt the alignment of their new homes.

Size: Medium

speed: Your base walking speed is 30 ft.

Languages: You can speak, read, and write Common, Abyssal, and Draconic.

parent race: Naga

race features:

Venomous

You are resistant to poison damage and cannot be poisoned.

Poisonous Spit

You can spit poison through your fangs. You know the Poison Spray cantrip. This is a natural ability and doesn't count as a magical effect or a spell. Constitution is your spellcasting ability for this feature.

Venomous Bite

When you successfully hit a creature with your Bite attack, you can make the target make a Constitution saving throw or become poisoned for 1 minute. The DC for this saving throw is equal to 8 + your Constitution modifier + your proficiency bonus.