C1519 Cranes in clouds

The entrance to the Heartless Sword Art was called "Sword Forging".

Sword Creation stage, what was forged was a body of sharp sword bone, and an invincible Sword Heart!

This skill was completely an external skill. It tempered one's muscles and bones, refined one's mind, and successfully cultivated it. A person was like a peerless divine sword; with a raise of the hand or foot