The Warp Rift of the Maledictum is the galaxy-spanning tear in reality that ripped open at the end of the 41st Millennium and cut the Imperium in half. The Imperium calls it the Cicatrix Maledictum, everyone else has their own name for it, and it’s the single biggest change to the setting since the Horus Heresy.
What the warp rift of the maledictum actually is
It’s not one clean cut but a chain of catastrophic Warp rifts running across much of the galaxy, bleeding raw Chaos into realspace. The Imperium names it the Cicatrix Maledictum, though the name ‘Great Rift’ shows up everywhere in fan and official writing.
It appeared at the close of the 41st Millennium during the Thirteenth Black Crusade, right after Cadia fell. Since then it’s divided the Imperium into roughly two halves and turned almost every world in the Emperor’s domain into a war zone.
What caused it
Nobody knows for certain, and the sources don’t pretend otherwise. The leading theory ties it to the destruction of the Cadian Pylons when Cadia broke, since those structures had been holding the Eye of Terror in check for millennia.
Other explanations get thrown around too: sorcery by Magnus the Red during the Siege of the Fenris System, the awakening of Ynnead, mass bloodshed in the Damocles Gulf, or the Ruinous Powers reacting to Roboute Guilliman coming back. Guilliman himself suspects Abaddon spent ten thousand years targeting worlds rich in blackstone on purpose, with Cadia as the final trigger.
All that’s genuinely certain is the timing and the result. The cause stays a mystery, and that ambiguity is deliberate.
What it does to the galaxy
The immediate disaster was the Blackness: countless Imperial worlds cut off, Warp travel and astropathic messages rendered nearly impossible, and Chaos forces sweeping in before anyone could coordinate a response.
The damage goes well beyond lost communications. Physics itself has started to fray. Time runs strangely across huge stretches of space: some worlds live through centuries in an instant, others freeze, others shift back and forth constantly.
Stars haven’t been spared either. Some have swollen and reddened, growing tendrils of superheated plasma that reach out and burn worlds, while others have been dragged bodily into the Warp. Whole star systems have simply vanished, and civilisations have torn themselves apart overnight under twisted skies.
What it’s called, and who calls it that
Every culture in the galaxy has its own name for the rift, which tells you how universally it’s been felt.
The Space Wolves and the people of Fenris call it Everdusk. To the Orks it’s Gork’s Grin, to the Asuryani the Dathedian, and to the T’au either the Greater Axial Rift or Mont’yhe’va, ‘the Devourer of Hope’. There are a thousand other names besides.
- Cicatrix Maledictum: the Imperial name
- Everdusk: Fenris and the Space Wolves
- Gork’s Grin: the Orks
- Dathedian: the Asuryani
- Mont’yhe’va / Greater Axial Rift: the T’au
- Crimson Path, Mouth of Ruin, Warpscar: other names in circulation
Why it matters for the setting
Before the rift, the Imperium was a single sprawling empire. After it, the two halves can barely reach each other, and that isolation drives most of the modern lore.
It’s the reason Guilliman came back, the reason the Indomitus Crusade exists, and the reason so many campaigns are set in a galaxy where help isn’t coming. If you’re reading anything set after the 41st Millennium, the rift is probably in the background.
Key facts
- The warp rift of the maledictum opened at the end of the 41st Millennium during the Thirteenth Black Crusade.
- It split the Imperium roughly in two and made Warp travel and astropathic communication nearly impossible across huge regions.
- Its cause is unknown; leading theories include the destroyed Cadian Pylons, Magnus’s sorcery, and blackstone sabotage by Abaddon.
- The rift distorts time, physics, and even stars, with some worlds frozen, others accelerated, and some systems vanishing entirely.
- It has dozens of names across the galaxy, including Everdusk, Gork’s Grin, Dathedian, and Mont’yhe’va.
FAQ
Is the Great Rift the same thing as the Cicatrix Maledictum?
Yes. ‘Great Rift’ is the general term, while ‘Cicatrix Maledictum’ is what the Imperium calls it. Both refer to the same chain of Warp rifts.
When did the warp rift of the maledictum open?
At the end of the 41st Millennium, during the Thirteenth Black Crusade, right after Cadia was destroyed.
Do we know what caused it?
No. Several theories exist, from the destroyed Cadian Pylons to Magnus’s sorcery or the awakening of Ynnead, but none are confirmed.
Can you cross the Great Rift?
It’s extremely dangerous. Warp travel through or near it is unreliable, and the rift’s effects on time and physics make any crossing a serious gamble.