Yuan-ti were originally humans who transformed themselves into serpent folk through ancient rituals. Most yuan-ti were corrupted into monsters by those rites, but some yuan-ti instead became a new people who mix characteristics of humans and snakes.
Blessed with resistance to magical and poisonous effects by the rituals that created them, each of these yuan-ti manifests their serpentine heritage in a variety of ways: a forked tongue, snake eyes, a snakelike nose, or some other ophidian characteristic. However a yuan-ti looks, they have the power to pursue great good or evil in the multiverse.
Creating Your Character
At 1st level, you choose whether your character is a member of the human race or of a fantastical race. If you select a fantastical race, follow these additional rules during character creation.
Ability Score Increases
When determining your character’s ability scores, increase one score by 2 and increase a different score by 1, or increase three different scores by 1. Follow this rule regardless of the method you use to determine the scores, such as rolling or point buy. The “Quick Build” section for your character’s class offers suggestions on which scores to increase. You can follow those suggestions or ignore them, but you can’t raise any of your scores above 20.
Languages
Your character can speak, read, and write Common and one other language that you and your DM agree is appropriate for the character. The Player’s Handbook offers a list of languages to choose from. The DM is free to modify that list for a campaign.
Creature Type
Every creature in D&D, including each player character, has a special tag in the rules that identifies the type of creature they are. Most player characters are of the Humanoid type. A race tells you what your character’s creature type is.
Here’s a list of the game’s creature types in alphabetical order: Aberration, Beast, Celestial, Construct, Dragon, Elemental, Fey, Fiend, Giant, Humanoid, Monstrosity, Ooze, Plant, Undead. These types don’t have rules themselves, but some rules in the game affect creatures of certain types in different ways. For example, the cure wounds spell doesn’t work on a Construct or an Undead.
Life Span
The typical life span of a player character in the D&D multiverse is about a century, assuming the character doesn’t meet a violent end on an adventure. Members of some races, such as dwarves and elves, can live for centuries. If typical members of a race can live longer than a century, that fact is mentioned in the race’s description.
Height and Weight
Player characters, regardless of race, typically fall into the same ranges of height and weight that humans have in our world. If you’d like to determine your character’s height or weight randomly, consult the Random Height and Weight table in the Player’s Handbook, and choose the row in the table that best represents the build you imagine for your character.
Yuan-ti Traits
As a yuan-ti, you have the following racial traits.
Creature Type
You are a Humanoid.
Size
You are Medium or Small. You choose the size when you select this race.
Speed
Your 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 discern colors in that darkness only as shades of gray.
Magic Resistance
You have advantage on saving throws against spells.
Poison Resilience
You have advantage on saving throws you make to avoid or end the poisoned condition on yourself. You also have resistance to poison damage.
Serpentine 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. You can also cast it using any spell slots you have of 2nd level or higher.
Intelligence, Wisdom, or Charisma is your spellcasting ability for these spells when you cast them with this trait (choose when you select this race).