In the universe of Warhammer 40,000, the Emperor created twenty Primarchs and twenty Space Marine Legions to unify the galaxy. But by the time of the Horus Heresy, only 18 remained. What happened to the two lost legions and their primarchs, the 'forgotten' and the 'purged'? In this video, I take a look at the evidence.

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Copyright: Unless noted in the video, all images © Games Workshop 1987-2022. Title music is 'Black Rainbows' by Karl Casey @WhiteBatAudio

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