In Warhammer 40k, the Horus Heresy is one of the most important moments in the saga. 9 out of the eighteen Primarchs betray the Imperium, causing a massive civil war that leaves most of them dead and the Emperor himself nearly dead on the golden throne. Such a crazy event has led to a multitude of what if ideas and scenarios, but one of the most popular is the Dornian Heresy. Telling the story of what if the original loyal and traitor Primarchs had swapped places.
This video basically summarizes what it goes over.
I won't go over everything cuz I myself haven't read the story, but I'll do it soon. In the meantime, here's some really dope art about the Dornian Heresy.
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