Under the Artificer armour it says that these masterpieces sometimes come with unusual features, like fibre re-weaving and other things, to make them more "special".
So what kind of features you think would be suitable to give these kind of armours, or what new "histories" would be added to reflect this masterpiece?
Rolling twice on the usual table is kinda dull, as there's so few entries and the normal power armours will have some of them already - artificer armours should feel different I think.
Some random ideas, with the armour costumised for the wearer in mind:
It comes with a built-in item (psychic hood or improved jump pack of some kind, for example).
+10 to some kind of test suitable for the weare.
).