Yuan-ti Pureblood

Yuan-ti are a race of monsters from Dungeons & Dragons based on the serpentfolk archetype, although somewhat more flexible in terms of being human/snake mishmashes than is usual.   They are of particular prominence in the Forgotten Realms setting, where they used to rule the world, or at least are one of the direct successors to a pre-humanoid empire, and in Eberron, where they have coatl-based good-aligned counterparts who serve the Silver Flame . In generic D&D, they are usually portrayed as descendants of mad serpent-worshipping witch-cults that fused and interbred with snakes in order to "evolve" into superior beings. Perhaps as a result of this, yuan-ti are commonly portrayed as having not only unusual, snake-based magical spells, but a natural talent for psionics.