A curious fact about Vikings is that they had legendary weapons imbued with the spirit of great fallen warriors which were stronger than any other weapon at the time. They had a ritual in which they would burn the body of their fallen warriors in the fires of the smelter while making weapons to “imbue” their spirit into it, what happened was that the carbon from the body they were burning formed an alloy with the iron of the weapon, making a crude form of steel in a time we’re everyone had iron weapons.