User blog comment:Fairy Tail Grand Master/What is the hidden blade made of?/@comment-4862210-20120627211714/@comment-1379800-20120628000739

I don't think Ezio's blade was easily severed. Think about it, that blade had been through over 50 years of action, and it took a full two-armed swing from a broadsword to break it. It also snapped on the joint, which would be a structural weakspot.