Komus, known as the Tyrant Star, is a stellar phenomenon in the Calixis Sector. The appearance of the star and visions that accompany it are said to herald in the doom of humanity. When the star does appear, it will be accompanied by dark prophecies, maddening visions, and mass panic. None are able to explain what exactly the star is or why it appears. It may be Eldar, Tyranid, or Chaos in origin.