The secret skill is to break through three levels

Bone Mountain, tenth floor.
The densely packed bone soldiers rushed forward frantically from all directions, while Owen Su stood there. Within a hundred meters around him, the vast power of the earth's origin and the sword intent were almost perfectly combined. The attacks launched by those bone soldiers were hindered by layers of heavy sword flow, and in the end only less than 10% of their power remained, continuing to affect Owen Su.
Less than 10% of the power... Even if Owen Su did not...