User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-3976024-20150827131012/@comment-24834479-20150830061836

1. That hasn't really been discussed much, but I assume they were made for the Angels by God. 2. There were likely more than just 2 humans in the garden of Eden. It is most likely they evolved and then we're all placed within the garden. 3. Yes, this knife can kill any demon (other than a knight of hell). 4. I assume they came into existence when their attribute did, but they might have come about within the darkness, like other forces such as God and Death. 5. I'm actually unsure about this. I remember one of the gods wanting to get Gabriel's blade to kill lucifer, but then again they tried to kill Raphael with an Angels blade. I would say that the blades of regular angels can kill archangels as well (incase the archangels turned evil).