Constructed from bones harvested from serpents and humans, a necrophidius is animated by occult magic, not unlife. Each necrophidius is built from the skeleton of a large snake, but its skull has been replaced by that of a humanoid creature. Some death cults or particularly cruel crafters seek out the skulls of specific individuals against whom they bear grudges to provide the head for their necrophidius. The final step of the construction is the alteration of the teeth and jaws to give the creature a more serpentine visage, complete with fangs.