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The original was posted on /r/40klore by /u/Aurrebesh on 2023-10-05 16:57:22.

I’m aware it took quite some time for Cawl to actually create them, but I don’t know if we have any specifics. Are there any books which elucidate what the Primaris did while on Mars and under Cawl’s supervision prior to the Indomitus Crusade?