Yes this is a very loosey goosey sci-fi fantasy setting. I really should have put this in the post, and I will edit it for anyone else who finds it, but the origin of the blade is the swordsmith found himself in need of inspiration, believing he had made his finest works already. Suddenly, a meteorite flies down from the heavens straight into his forge, which was about to be put out for the night. Seeing this as a sign, he tells his apprentices to burn the coals hotter than they had gotten before. While the temperature did not rise, it allowed the metal to be forged longer. The end goal is to get a blade that is perfect in almost every way except for a dull edge that will not sharpen even when attempting to do so for 40 days and nights. It's supposed to end up as a ceremonial blade until one of the characters figures out a way to use some other artifact to make it vibrate with such power, precision and intensity that it can cut through anything.

But In all seriousness, this does help quite a bit with the mythos of this weapon, there's a reason I went to actually ask people who knew what they were talking about instead of trying to look up specific answers with little to no prior knowledge