Board Thread:Suggestions forum/@comment-26210095-20151019020544/@comment-26444332-20151019203904

Thorin Stonehelm wrote:

it shouldn't be craftable because Arnor fell, the time at which the mod takes place would make no sense for arnorian armor to be crafted

The Rangers might have kept the knowledge alive, as would have Elrond(His home was noted to be a refuge for all knowledge that was lost; This includes the Arnorian secrets of metalcraft).