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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.
It is worth noting that chances of getting each of the 6 stats are the same, nothing in the NPC suggests that getting a +1 STR is any more difficult than getting a +1 LUK. The basic enchantment success rate for each armor category, regardless of +1, +2 or +3: (Again according to eAthena Revision 15075)