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The original was posted on /r/40klore by /u/My_redditaccount657 on 2023-10-06 21:51:21.


In lore, most of the Chaos Marines fighting the imperium were veterans of the Horus Heresy

But 10,000 years later, what is the make up of that number? And does that apply to non-astartes that aligned themselves with the war master?