Yuan-Ti Purebloods

The Yuan-ti only existed as Purebloods on the Cloudsea, but unlike other realms, they had a friendly society which originally formed out of refugees. They were capable of turning into a viper at will, once per day. Their home was in the Horns region of the Always Dark, where they lived in the Western Horn city of Eshulssestu, a city devoted to learning and studying the arts.

## Yuan-ti Arrived From Eberron

The Yuan-ti Purebloods of the Cloudsea originated from a ruined temple in Eberron’s jungles of Xen’drik. In a temple, analogous to the Tomb of Annihilation’s Fane of the Night Serpent, the Eberron Yuan-ti would capture human slaves and occasionally toss those who fit their own designs into a pool of blood where they would transform into Pureblood. Even more rarely, a good natured human would escape captivity and stumble into the ritual pool.

Some of these good natured Purebloods who survived would find themselves whisked into the Cloudsea during their sleep, when the Hawk was out hunting. Mistaking them for evil snakes, the Hawk on capturing them would discover they were not only good, but that they were helpless creatures in their own realm, and as such would release them into the safety of the Cloudsea. In time, they settled on the comforts of the western horn where they created an erudite culture devoted to philosophy and the fine arts.

## Yuan-Ti Pureblood Features

* Ability Score Increase. Your Charisma score increases by 2, and your Intelligence score increases by 1.
* Age. Purebloods mature at the same rate as humans and have lifespans similar in length to theirs.

* Size. Purebloods match humans in average size and weight. 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 grey.

* 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.

* 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.

## Yuan-Ti Transformation

All Purebloods in the Cloudsea can transform into Medium Vipers equal to their own mass at level 1, each 5 levels their size increases by half a size category. The transformation can occur once per day, and last as long as the Pureblood desires. If the Pureblood falls asleep in snake form, they will transform back to their humanoid form at an unspecified point during deep sleep. Yuan-ti crafted equipment will shape change with the transformation, but lose its characteristics, disappearing into the snake body. Gear of another nature will fall off, and have to be recovered after returning to Pureblood form.

Bite attack is equivalent to an unarmed strike that does piercing damage. At level 1 the attack does 1d4, plus proficiency bonus for damage, increasing by one die category every five levels thereafter.

A successful attack will also poison the recipient of the bite, with a poison that does 1d4 damage on a failed fortitude saving throw with DC 10. For every 5 levels the damage die increases by one factor, and the DC increases to 12, 15, and then 18. The range is the length of the snake’s body.

* Constrict. Melee Weapon Attack: reach 5 ft. per size category, one creature. Hit: (1d8) bludgeoning damage. The target is grappled (escape dc 16) Until this grapple ends, the creature is restrained, and the snake can't move or constrict another target, but can still bite the creature or an adjacent target. If the creature is larger than the snake, the snake can partially constrict or otherwise constrict a limb of much larger foes.

    Medium snakes were 10-19 feet in length, while large snakes were 20-30 feet long