Pureblood

Purebloods closely resemble humans, yet they can't pass for human under close scrutiny because there's always some hint of its true nature.

Ability Score Increase. Your Charisma score increases by 2, and your Intelligence score increases by 1.

Innate Spellcasting. You know the poison spray cantrip. You can cast animal friendship an unlimited number of times with this trait, but you can target only snakes with it. Starting at 3rd level, you can also cast suggestion with this trait. Once you cast it, you can't do so again until you finish a long rest. Charisma is your spellcasting ability for these spells.

Pass for Human. You gain proficiency with disguise kits, and have advantage on checks to disguise yourself as a human.

Magic Resistance. You have advantage on saving throws against spells and other magical effects.

Malison

A malison is a hideous blend of human and serpentine features. This blend is neither consistent, nor even. As such, many variations exist.

Ability Score Increase. Your Dexterity score increases by 2, and your Strength score increases by 1.

Shapechanger. You have the ability to assume the form of a snake, your statistics stay the same in each form. Changing from either of your forms into the other is an action. You remain in this form unless you drop to 0 hit points or you choose to revert.

Snake Bite. Your teeth are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal piercing damage equal to 1d4 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike. Furthermore, in your snake form, your unarmed strike deals an additional 2d6 points of poison damage, once per turn.

Malison Type. Malisons come in 5 variants, each with their own unique mutations. You are one of these types. Once you make this choice you cannot change it.

• Type 1: You have a human body with a snake head. Your abilities are as described above.
• Type 2: You have a human head and body, but two snakes for arms. You cannot wield weapons in your hands, but you can use your unarmed strike as a bonus action, and deal poison damage with it in your true form as if you were in your snake form and are not limited to dealing it once per turn.
• Type 3: You have a humanoid head and upper body, but the lower body of a giant snake. You cannot bite in your true form, but are immune to the prone condition and can grapple creatures with its lower body.

Abomination

The true image of the yuan-ti as their people see it. These giant serpents tower over their kind and humanity.

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

Large. Abominations tower over their lesser kin. Your size is Large.

Snake Bite. Your teeth are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal piercing damage equal to 1d6 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.