User blog comment:BMan2000/Naruke Classics: Batch 6 Units/@comment-26336535-20151215002623

Actually, the lore is broken for Duran. It might look like he has the Sacred Blade, and his UBB is called that, but if you actually looked at the Sacred Blade, it has nothing in common with him.

I can't find the links, but you can probably look it up.

Gumi basically translated the spheres incorrectly (nice one Gimu), and Duran was actually supposed to have the Sacred Gem (which actually has his abilities). The lore from JP has him wielding the Sacred Gem, and his UBB in JP refers to the Sacred Gem.