i have probably read every 40k crossover fanfic on this site most are good a few are really good and rest are usually terrible.
but most have one thing in common it usually involves a space marine or a small group of space marines or imperial guardsmen ending up on equestria.
some dont have any space marines or guardsmen at all but instead have another 40k faction appear usually chaos or orks and i have enjoyed reading almost every single one.

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