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 which then transforms the human minds and makes them ready to wholly embrace the darkness. None are able to explain what exactly the star is or why it appears. It may be Eldar, Tyranid, or Chaos in origin  though some scolars noted the repeated word 'devour' in the prophesy. The actual text of the prophecy is locked in the Bastion Serpentis archives, and Lord Inquisitor Zerbe only allows a very favoured persons to read and analyze the complete transcript.