From D&D Wiki
Yuan-ti HalfBreeds possesses a humanoid head and torso and a long, serpentine tail. They are generally slender, with lithe bodies that, in some cases, mask the strength hidden within their reptilian musculature. Their eyes have a reptilian slit pupil, while yuan-ti bear themselves with a cold, arrogant indifference or contempt towards others, even of their own kin, their halfblood kin are far more empathetic towards others.
The Yuan-ti HalfBreeds are a byproduct of Yuan-ti and their slave inter breeding. Yuan-ti that keep these offsprings keep them as slaves, used for sacrificial rituals, used as bait for hunting greater beast and are even cannibalized for food.
HalfBreeds unlike their cousins they do not seem to hold the same cruelty with in them and can become extremely empathetic to a fault. In the Yuan-ti society HalfBreed slaves try their best to stick together, sharing food with any Halfbreeds that are sick and injured.Those knowing their fate in Yuan-ti society they will try their best to sneak gold and other treasures to buy safe passage away from Faerun and the Houses of the Coiled Cabal. Once they find their freedom they quickly realized that they are shunned by other races do to the their serpent appearance and easily being mistaken for their cruel cousins of the Yuan-ti Houses.
Yuan-ti HalfBreed Names
At birth they are never given names and escaped slaves will often take the names of those that have help them either escaped or helped the integrated into a society.
Yuan-ti HalfBreed Traits
HalfBreeds chose one Blood Line and one Half Blood Trait
Ability Score Increase. Your dexterity score increases by 2, your Intelligence score increases by 1 and a -2 to Constitution. As normal, you can't increase an ability score above 20 using this feature.
Age. They seem to age at the same rate as half-elves but the standard lifespan can far exceed that of their cousins, some and live as long as 155 years.
Alignment. Most if not all can be some where between neutral good, chaotic good, true neutral, chaotic neutral. Very few will fall into despair taking up and evil alignment and inflicting the same torment that they themselves have enduring.
Size. Even though Yuan-ti HalfBreeds are long because of their muscular tail when standing erect, they occupy the same space as most humanoids. Your size is Medium.
Speed. Your base walking speed is 30 feet, swimming and climbing speed is 20.
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.
Poison Resistance.. You have resistance to poison damage, and you have advantage on saving throws against becoming poisoned.
Serpentine Empathy.. You can communicate simple ideas with snakes.
Serpent Reflex. Any grapples made against you that are not on rough terrain are done so with disadvantage.
Constrictor Grapple.. Natural Weapon.Yuan-ti HalfBreed can constrict a foe with its powerful tail dealing 1d8 bludgeoning damage + either your Strength or Dexterity modifier that you use for this Natural Weapon. When you grappling a creature with your tail you can use both your hands as normal.The target must make a DC 13 saving throw of whatever modifier is being use at the attack if it they fail they retake the bludgeoning damages, The Creature is restrained and it's attack rolls are with disadvantage. You an not restrained creatures that are larger than you but the will be forced to move at half speed. Increase the damage by 1d8 at levels 6, 12, 18.
Extaminaar Blood Line.. One with the Old Blood.This is a full action. Once per day you may transform into any snake (but not Flying) for up to 3 minutes that is Half you maximum hit points plus your constitution modifier, but you keep own Constitution, mental ability scores, and Hit Dice. at lvl 5 you can cast this up to twice per day and at lvl 10 you can use both charges and transform into any snake that is double you maximum hit points plus your constitution modifier, after doing this you may not use this for any transform for 2 weeks, at lvl 15 you gain 1 more charge to your transformations can now transform in to flying snake and you can stay transformed for up 2 an hour. At lvl 20 you can spend your 3 charges to transform into any snake that is double you maximum hit points plus your constitution modifier and roll a 1d3 and multiply the stats of the snake you transform into and you now gain that snakes full set of stats.
Hiss Iafi BloodLine.. Serpents Gazes: You gain proficiency to persuasion and intimidation and once per day you can spend 1hour looking for gold and gain anything between 1-4 gold roll a 1d4 and test your luck.
Eselemas Blood Line.. At lvl 1 you gain proficiencies with all simple. At lvl 5 you gain proficiencies with all martial weapons. At lvl 10 with all shields and armor.
Jennestas Blood Line.. Comillion Hide.You can attempt to hide even when you are only lightly obscured by foliage, heavy rain, falling snow, mist, and other natural phenomena. You gain proficiency to stealth as well as you move through difficult and rough terrain with ease.
Se Sehen. Venomous Bite. This is a natural weapon and does not provoke attacks of opportunity and can be used as a bonus action. You deal 1d4+ piercing damage your Strength or Dexterity modifier.The target must make a DC 13 Constitution saving throw, taking 2d4 poison damage on a failed save, or half as much damage on a successful one. Increase the damage For both piercing and poison damage by plus 1d4 at levels 6, 12, 18.
Languages. You can speak, read, and write Common, Abyssal, DeepSpeek and Draconic.
HalfBreed's HalfBlood Traits
The HalfBreeds other parent traits show up as they hit maturity.
Tiefling Traits.. You gain proficiency in one skill of your choice and one Tiefling race or sub-race trait.
Human Traits.. You gain proficiency in one skill of your choice and You gain one feat of your choice.
Elf Traits.. You gain proficiency in one skill of your choice and you may pick one Elf race or sub-race trait
When creating a <race name> character, you can use the following table of traits, ideals, bonds and flaws to help flesh out your character. Use these tables in addition to or in place of your background's characteristics.