Nova Terra Interregnum
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Nova Terra Interregnum is one of the major time periods of the Imperium of Man. It was preceded by the Forging and followed by the Age of Apostasy, stretching from mid-M34 to the beginning of M36.
During this time period, the leaders of Nova Terra declared themselves independent of the High Lords of Terra, and the Imperium was split in twain. Despite the fact this sounds Awesome, there is little fluff around it, mostly because it doesn't have anything to do with most of the major factions (besides, maybe, the Ecclesiarchy).
The Cataclysm of Souls
An awesome-sounding but sadly limited piece of fluff, the Cataclysm of Souls was a period of religious wars at the end of M35, when the Ecclesiarchy reshaped the Imperium as a religious state, but the Ur-council of Nova Terra rejected their teachings. Which should have happened on Terra, given the Emperor's laws that the Space Marines and even Custodes (on Terra, at least, as that is their responsibility) were tasked by Him to uphold. Nope, they let the Imperium become a cess-pit.
Cursed Founding
The 21st Founding happened during this time period. Despite their Awesome mutations, the Chapters of this founding got wiped out by the Grey Knights.
Ah wait! Not so fast. This was only partially true. While the Inquisition and the Grey Knights did start going around offing any the 21st founding chapters that went over the line (Flame Falcons for example), others escaped or have toed the line enough they are tolerated by the Inquistion if only barely. The Blood Gorgons turned traitor and fled to hook up with Chaos while the Black Dragons, Minotaurs, Lamenters, and Sons of Antaeus are all still on active service. The Fire Hawks would later become the Legion of the Damned.