It all happened so quickly... Day turned into night, and a black sun shone in the sky. People started panicking and screaming. And then, one dreadful day later, they attacked each other, and themselves; some even tried to gouge out their own eyes and tear off their skin. I swear I even felt the ground shake. I— I hid in the sewers and didn’t come out for two days. When I did, starved and exhausted, the Star was gone, and the city streets were filled with blood and disfigured bodies.
Survivor’s eyewitness testimonyThe Tyrant Star is an incomprehensible transient stellar phenomenon that has been tormenting the Calixis Sector for years. A monstrous, star-like object surrounded by unnatural darkness, it is a threat of immense proportions that remains a mystery even to the Inquisition. Appearing seemingly at random across the Calixis Sector, it immediately plunges everything around it into deep gloom and despair, often eclipsing that system’s natural star in the process.
In
Warhammer 40,000: Dark Heresy, you will face not only the Tyrant Star itself, but also the unsettling secrets of its true nature. As an Inquisitorial acolyte, you will have to personally take part in uncovering the very essence of this mysterious and terrifying entity.
With its sinister radiation and unpredictable movements, this gargantuan celestial body is a harbinger of doom wherever it appears. When manifesting, the Tyrant Star causes geological disasters, mass deaths, madness, warp anomalies, and other cataclysmic events. Any system unfortunate enough to be caught in its embrace is destined to suffer greatly.

In light of such horrors, the malevolent shining of this ill omen has also attracted the attention of doomsayers, leading to the rise of numerous fanatical cults whose followers see the Tyrant Star as the herald of an unfolding catastrophe that will mark the Imperium’s end.
Despite the proliferation of such apocalyptic beliefs, the true nature of the Tyrant Star remains unknown. Not a single scholar in the Imperium has been able to give a satisfactory explanation for its existence; nevertheless, powerful forces, with vast resources at their disposal, are keeping watch.
Years ago, in an effort to combat this growing threat, the Tyrantine Cabal was created — a shadowy and dangerous Inquisitorial conclave that unites its members under a single purpose: to fathom the mystery of the Tyrant Star. With their headquarters on Lachesis, one of Scintilla’s moons, they monitor the Star's activities and investigate its nature. The leader of the Tyrantine Cabal is believed to be Lord Inquisitor Zerbe, who is rarely seen outside of Bastion Serpentis and often holds meetings with other suspected members of the secretive group.

In recent times, the Tyrant Star has begun manifesting with growing frequency. Some scholars believe this is a sign that its power is accumulating. And whether it is a portent of a cosmic cataclysm or the precursor to an invasion, one thing is certain: until the mystery of this entity is finally solved, the Calixis Sector, and possibly the Imperium itself, may well be standing on the brink of annihilation.
And what will you do in the face of such danger? Will you uncover the secret of the Tyrant Star, thanks to your unyielding faith in your duty — or will you fall to heresy? The choice is yours. The time has come to confront one of the Imperium's most mysterious threats; Scintilla itself is at stake.

Prepare yourself for this grim omen and
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Not even the Emperor Himself can protect you now. You are on your own, acolyte. Proceed with caution, and let no heresy escape you.