Homebrew Yuan-Ti Malison Species Details

Humanoid in shape but have a wide variety of noticeable serpentine features, such as a snakelike tail in place of legs, a complete covering of scales, a hood like a cobra, a snake's head, or snakes in place of arms. Malisons, also called halfbloods, serve as warriors and temple assistants.

Abilities

Like all yuan-ti, they could morph their bodies into the form of any viper by force of will alone and could sense the presence of any poison nearby. They were also innately resistant to magic. They were more intelligent than purebloods, which still were more intelligent than the average human. 

The psionic powers of Malisons included the ability to charm humanoids, to entrance animals, to cause fear, to create darkness, and to command plants to entangle opponents.

As opposed to the Purebloods, Malisons can not hide their lineage without magic. Because of this they rarely enter society. There are the outliers who have lived among the other races, though this was usually out of necessity rather than choice. 

Life Cycle

Pure bloods could mate with Malisons or abominations but usually did not. Like other yuan-ti, they hatched from eggs and reached adulthood by twelve years of age. An average lifespan for any yuan-ti was 80 years, but attaining an age as great as 120 years was possible.

Yuan-Ti Malison Traits

The more monstrous cousin of the Pureblood, the Yuan-Ti Malison is a far stronger and versatile creature.

Ability Score Increase

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

Age

Malisons mature at the same rate as humans but live longer on average, to about a hundred years.

Size

Malisons are slightly taller than humans, about 6 to 7 feet. Your size is Medium. 

Speed

Your base walking speed is 30 feet.

Darkvision

You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.

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.

Magic Resistance

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

Poison Immunity

You are immune to poison damage and the poisoned condition.

Languages

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