The Imperium faces increasing strife between the growing political dominance of its state church, the Adeptus Ministorum, and the other organs of Imperial power even as the Imperium tears itself in half for over 800 years during the Nova Terra Interregnum.
In the wake of the War of the Beast, the new peace is soon challenged by the growing political strife on the Senatorum Imperialis between the Ecclesiarchy, the state church, and the other, more secular organizations of the Imperium such as the Adeptus Astartes and the Adeptus Mechanicus.
This conflict culminates in the Nova Terra Interregnum in the 35th Millennium when the entire Segmentum Pacificus, ruled from the world of Nova Terra, essentially secedes from the wider Imperium as a protest against the growing political dominance of the state church.
However, this schism was also propagated by the agents of Chaos, particularly the Renegade Dark Angels known as the Fallen. Additionally, the Mechanicus is also torn apart by religious dissension in the related Moirae Schism.
The Dark Angels take the lead in dealing with their Fallen brethren while the Mechanicus deals with its rebels internally. The result is the end of the Interregnum and the reunification of the Imperium at the end of the 35th Millennium. But a dark new era, an Age of Apostasy, now looms on the horizon…
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