Yuan-ti abomination

Yuan-ti abominations were monstrous serpent-like creatures, almost completely snakelike except for a roughly humanoid torso. They formed the highest caste of yuan-ti society.

Description
With their almost completely serpentine form and vaguely humanoid arms able to use weapons and tools, abominations were the form of yuan-ti that most closely resembled the originally intended appearance of the yuan-ti race as envisioned by the serpent gods.

Society
Since they were the most prestigious caste within yuan-ti society, abominations were almost always the leaders of their cities, except if a yuan-ti anathema were present.