Serpent

You are a Serpent Sorcerer, a type of Sorcerer which most thought exclusive to Yuan-Ti. How did you get this Magic, did a Serpent Deity bless you, do you descend from a Yuan-Ti or another Serpent Creature, did you consume the corpse a powerful serpent, or another method? You can use your new dark sorcery for any reason you wish, but be warned while this path  can lead to great power your mind may become warped and sinister; the Yuan-Ti are the prime example of this.

Serpent Fate

At 1st level, you follow down the path the original Yuan-Ti Sorcerers went down. Pick a path which will grant you more power down the line. The Serpent Fate you pick now will be the type you get at later levels.

SERPENT FATE	FEATURE
Pureblood	Get +1 to your Charisma at 1st, 5th, 10th, 15th, and 18th level.
Halfblood	Get +1 to your HP at 1st, 5th, 10th, 15th, and 18th level.
Abomination	Get +1 to your AC (Natural Armor) at 1st, 5th, 10th, 15th, and 18th level.

You also get the ability to cast Animal Friendship on Snakes, and the amount of times you can cast it is based on your overall level. So a level 17 Sorcerer could cast it 17 times. After you cast it the amount of times your able to you can recharge via short or long rest.

 

Serpentine

At Level 1, your power as a Serpent Sorcerer grants you advantage against poison, at level 5 it gives your foes disadvantage to poison from your spells, and at level 10 it grants you an immunity to poison.

It also grants you Dark Vision (60 Feet), if you don’t already have it.

Slither

Starting at 6th level, you get to get another Serpent Fate feature; the one you get must be the same as last time.

SERPENT FATE	FEATURE
Pureblood	You can pick three skills to get advantage on when dealing with humanoids.
Halfblood	You gain advantage in charisma checks with any type of Serpentine creature.
Abomination	Can turn into a small, medium, or large snake, which once used can only be used again after a short or long rest. When in this for you get advantage on stealth rolls, lose the ability to speak unless you know Draconic then you can speak that, and can do a bite for 10(3D6) Poison-Damage.

 

Snake Eater

At 14th level, you gain the ability to eat the flesh of Serpentine creatures to heal yourself, if cooked meat you get healed by 1D6, but if raw flesh is eat you get healed by 2D8 with advantage. 
At 18th level, you can eat the flesh of sentient serpentine creatures to heal yourself by half of your maximum HP, and cure yourself of Disease, Blindness, Deafness, and Curses. However if you cook the flesh it instead only does the same as eating the cooked flesh of a regular Serpentine creatures.

Serpent Lord

Beginning at 18th level, you get another feature from the Serpent Fate you chose.

SERPENT FATE	FEATURE
Pureblood	Can use Sorcery Points to damage someone with poison, the amount of points used is equivalent to the amount of D8s used on the target. The target must be in sight of you.
Halfblood	As a Bonus Action you can heal yourself by using your Sorcery Points, with each point being another D10.
Abomination	Can eat other casters to gain new spells, you can eat another spellcaster to gain one of their spells as long as you can cast the tier of the spell you want from them and when you do this you must make sure you’ve eaten every last bite.

You also gain Magic Resistance if it is not already possessed.