Yuan-ti Pureblood

The serpent creatures known as yuan-ti are all that remains of an ancient human empire. Ages ago their dark gods taught them profane rituals to mix their flesh with that of snakes, producing a caste-based society of hybrids in which the most snake-like are the leaders and the most humanlike are spies and agents in foreign lands. While called pureblood by the other humanoid races, these yuan-ti are the lowest of their caste system. The grand civilization of the yuan-ti once spread across large swaths of Comuset and Ibora, but fell to disarray thousands of years ago. Since then, the yuan-ti have plotted and schemed in the shadows of other kingdoms, planning for the day they will once again rise to mastery over those who do not follow their deities.
Yuan-ti purebloods are blessed with resistance to magical and poisonous effects by the rituals that created them, each of them manifesting their serpentine heritage in a variety of ways: a forked tongue, snake eyes, a snakelike nose, patches of scales, or some other ophidian characteristics. While many purebloods are dedicated to the plans of their higher ups, it isn’t unheard of for them to strike out to pursue their own desires away from where they are considered the lowest of the empire.