The Dark Edge Sword Art skills were techniques that were produced by the Dark Faction founder, who, just like Raze, was someone from another world.
These techniques were incredibly special since they had two ways to use them: the regular way with just Qi, and an added way with magic.
Because of this, it was hard for Raze to perfect the skills. It had been a long time since he had studied something and didn't quite understand how they worked.
Which was why he was only able to learn up to the 4th formation out of the eight formations so far. However, during his fight against one of the dimension's bosses with incredibly hard skin, he had used the 4th formation, the Void Pulse Technique. He had yet to use the 3rd formation. There hadn't been a time when he could use it.
Niang had survived the 2nd and 4th strikes so they were useless, and the first formation was just a bind; it didn't actually do any damage.
