Yuan-ti are a race of half-snake people who have to the extent to give themselves and their forms to the snake gods they worship. Purebloods are the most human-like of all true yuan-ti and one of three main breeds—the other two being the half-bloods and the abominations. They resemble humans but with minor reptilian features, such as snake-like eyes, a forked tongue, and patches of scales on their skin. While not as powerful as other yuan-ti forms, purebloods still had psionic powers. Like all yuan-ti, they could morph their bodies into the form of any viper by force of will alone and could sense the presence of any poison nearby. They were also innately resistant to magic. Purebloods could mate with half-bloods or abominations but usually did not. Like other yuan-ti, they hatched from eggs and reached adulthood by twelve years of age. Purebloods were very adept at impersonating humans, and often entered human settlements in disguise as spies.