User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4361439-20130613165941/@comment-4361439-20130613183042

It's possible. It's been awhile since I first opened up the path to that cave, so one of the game's characters might explain what the sword is from at that point. Other than that, I've played the game solo all the way to HR9, and none of the game's characters had anything to say about it's origins that I can remember.