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Descendants of humans whose blood has been fouled, yuan-ti have varying degrees of snakelike body parts. They are highly intelligent and evil, always plotting to advance their causes.
There are three major varieties of yuan-ti: purebloods, halfbreeds, and abominations. A pureblood can pass for human 80% of the time. It has only slight differences from true humans, such as slit eyes, or a forked tongue, maybe even small fangs. Halfbreeds are part human and part snake. ...
Abominations are either all snake (50%) or have only a single human feature, either head or arms, and are of large size (10 feet long). Halfbreeds and abominations disdain wearing human clothing or armor, while purebloods do not. All yuan-ti use weapons and other items. Yuan-ti do not give off an odor that humans can detect. However, animals will detect a dry, musty smell on them. The snake features of these foul creatures vary greatly from simple green and brown scales to wild patterns of stripes, diamonds, and whorls in reds and blues. Yuan-ti speak their own language. They can also speak with any snake or snakelike creature. Those with human heads speak common besides.

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