“Entry: ‘Obscuro’—The nature of the threat is either unknown, resists analysis, is deliberately hidden, or falls outside the normal categories of danger. This threat classification is also in rare circumstances applied to forbidden dangers of mankind’s own forgotten antiquity.”
— Definitions of the Common Inquisitorial Threat Ratings, Tabernacle of the Conclaves Segmentum
The Tyrant Star, also known as Komus, is an uncategorised stellar anomaly found in the Calixis Sector of the Segmentum Obscurus. Komus appears as a black dwarf star whose arrival in the sky of a world is seen as an imminent herald of catastrophe, while the existence of the Tyrant Star is itself part of a wider prophecy called the Hereticus Tenebrae that is of great interest to the Imperial Inquisition. Unraveling this prophecy and the role of the Tyrant Star may be crucial to preventing a cataclysm that will consume not only the worlds of the Calixis Sector but perhaps the entire Imperium of Man.