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Nordic Carved Armor requires a Smithing level of 50 and the Advanced Armors perk to create. Pieces can be upgraded with a quicksilver ingot at a workbench and also benefit from the Advanced Armors perk, which doubles the improvement.
This allows players to pick and choose how much of a bonus want from each line. One very interesting (and somewhat peculiar) note is that none of the active skills for the three armor types currently require you to actually be wearing that armor type. Bear in mind while reading these skill lines that there are a total of seven armor slots to fill (chest, legs, helm, shoulders, gloves, boots, belt).