The White King is one of the names the witness has used to identify the being in the above posts. He is of the royal caste.
The jaw is wider than in post #537 and less angular, per input from the witness. I'm still working out the exact shape. There may be more details available later on.
Have you ever heard of a reptilian with a vertically elongated head and an unusual bump on the forehead? Here he is. I'm exploring variations on his many jagged teeth.