He also seems to be connected in some way to Fire God HUEHUETEOTL.
XIUHCOATL is very serpentine and is often portrayed as a jade figurine with a head at each end. This must be one of the world’s most frequently used artifacts. There is hardly a book or article on Mexico that does not reproduce this image, from line drawings to full color plates.
Whatever XIUHCOATL used to do in the way of drought and burning earth has now been forsaken in the interests of publicity.