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We are likely using the MK2 power armor at this stage for astartes, and the "Acillian Armor", which likely are mechanics wise the same but fluffwise come from different sources/means.
Which is good because it means in setting we have two ways to produce armor, just like we have two ways to produce soldiers, for twice the things! As befitting of the Second Legion!
On that note, if we were to aesthetically tweak it for looks only, how Jermanic do we want our armors to be?