The variety among yuan-ti doesn’t end with their physical characteristics. Some of them are born with powers that are unusual or even unique among their kind. High-ranking yuan-ti might have one or more of the following abilities, either replacing or augmenting what a normal yuan-ti can do.

You can polymorph into a Medium giant poisonous snake, or into a Large constrictor snake, or back into your true form. Your statistics are the same in each form, except for the size change noted. Any equipment you are wearing or carrying isn’t transformed, and you don't change form if you die.

You can use this ability once per short rest.