User blog comment:Maki Kuronami/Weapons Guide (Basics)/@comment-24260323-20140215234528/@comment-10380701-20140216000055

We're not even entirely sure how advanced Remnant is. Due to that, any past events may have some high-level weaponry already. Just look at Jaune's sword, which is 200+ years old, yet has already demonstrated the basics of transforming courtesy of it's sheath.