User blog:Legionaire22/Not an Ending Blog

But still an important question!

As a fencer and collector of swords, i must ask... What could Kai Lengs sword possibly be made of? It can pierce through the metal of a car and it can slash at you, but it can't hold being backhand-slapped by an armored gauntlet?

This means: The sword is oddly 1-purposed and Kai Leng is one hell of a swordsman to be able to use it.

Unless he just channels his biotic powers into it. I guess that could work.