History of Warhammer 40,000

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Fall of Cadia and Opening of the Great Rift
Celestial / Cosmic

Cadia falls to the Despoiler, tearing the galaxy in twain as the Great Rift spreads from the Eye of Terror all the way to the Hadax Anomoly.
The planet still broke before the guard did.

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Hexarchy Crisis
Political event

A hyper conservative faction of former members of the Senatorum Imperialis attempt to launch a Coup to overthrow Guilliman while he is away waging the Indomidus Crusade.
Needless to say they all die... horribly... those who remained alive were quick to endorse his new title as Imperial Regent.

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History of the Galaxy