Silver Quality Swordsmanship

Despite the heavy blow, Jiang Xiao's body still remained strong and did not fall apart.

Jiang Xiao had the Star Technique "Endurance". Besides, his Star Technique had been upgraded to Gold Quality.

In the beginning, the mercenary corp leader who entered the snowfield had also used the Gold Quality Star Technique, Body of Steel, which was a defensive Star Technique that made his body and skin impenetrable, even by a dagger.

Although "Endurance" and "Body of Steel" were different Star Techniques, "Endurance" also increased the user's defense.

Both are Gold Quality Star Techniques, but why was the mercenary corp's skin impenetrable while mine got torn by the Ape Ghouls?

Is it because my physical fitness is not up to standard? Or am I not competent enough to exhibit the full effects of the Gold Quality Star Technique?