User blog comment:Buddyfight Unified Universe/Will There Ever Be Another Blade Beast? (Observations of the Origins of the Blade Beasts and questions moving forward.)/@comment-3974145-20160827085735

"but I just can't picture a Blade Beast coming from anything other than the Five Elite Swords."

The Blade Beasts are all Japanese Blades and Onimaru is not one of the Elite Swords he's one of the Five Heavenly Swords. So those swords can all be Blade Beasts too. Not to mention we got three more Japanese Blades that can be turned into Monsters too. I will be very upset if Kuromuramasa is never given a Blade Beast form :(