Your Strength, Constitution, and
Charisma scores each increase by 1.

Yuan-ti abominations stand about 5 feet tall when
upright, but the total length of their bodies, head to tail,
ranges from 10 to as much as 20 feet. Your size is Medium.

Your base walking speed is 30 feet.

You have superior vision in dark and dim
conditions. 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.

You can cast animal friendship at
will, but you can target only snakes with it.

Your constricting serpentine body as
well as your fanged maw are natural weapons, which you can
use to make unarmed strikes. If you hit with your bite, you
deal piercing damage equal to 1d6 + your Strength modifier.
If you hit with your constrict attack, you deal bludgeoning
damage equal to 1d4 + your Strength modifier, and the target
must succeed on a Strength saving throw with a DC equal to
8 + your proficiency bonus + your Strength modifier or
become grappled. Until this grapple ends, your speed is 0 and
you can’t constrict another target. At the start of your turn
while you are constricting a target, you can use your bonus
action to squeeze, dealing damage equal to your Strength modifier.

You have advantage on saving throws
against poison, and you have resistance against poison
damage.

You have advantage on all
Intelligence, Wisdom, and Charisma saving throws against
magic.

Your serpentine body lets you swiftly right
yourself. When you are prone, standing up uses only 5 feet of
your movement.

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