User blog comment:B214/Question and Answers/@comment-16075832-20130718154321/@comment-115.133.205.90-20130718162822

I don't think that's possible the Sword of Betrayer was a coincidence that never happened before, the Heavens were only able to duplicate it after Kiba gave them a sample. And even if such a sword exist, only Humans or reincarnate Angels/Devils can use them, so it's pointless to create it anyway.