Man this is just so confusing, it keeps listing holy, magic and demon swords, yet also saying there is 7, yet also some are destroyed. Is it 7 of each originally? But he also said it was the 6th demon sword he broke, so should only be his left, yet there is one other right away. The numbers just don't add up at all, also why is his demon sword not a problem, is it only the holy swords that are a problem? But what about the magic ones, also if demon swords aren't a problem why break them? Also why would he keep so quite about this? If every 1000 years a country is just wiped off the face of the world no way in hell that is covered up, or is it literally the entire world that is wiped, if so how has society gotten to were it is from scratch in 1000 years. Every time nearby counties would notice what happened and even if the nobles don't tell them what caused it the populace would notice and have stories of its sudden disappearance. And both nobles and commoners would fear this unknown threat, its not like it cares about your authority. While some may try to use it, many would try to find out what does it to avoid it happening to them. As its every 1000 years they should be paranoid of it happening to their nation in 3 years, someone showing up out of nowhere with abilities like the MC and claiming to know the source would at the very least eyebrow raising and worth thinking about and looking into a bit. These swords also are well known, it should have been noticed that hey they were all together in the country when it vanished, that trend should be very easy to notice with how they are in the hands of high profiles knights. All in all the "plot" is off to a very bad contrived start with nonsense worldbuilding and common sense, the translation quality isn't good, but rather than make it worse, it seems to be hiding how bad the writing is.