The sword becomes a character before you realize it. Every strike carries decades of accumulated resentment, every technique is a prayer to something the wielder thought was dead. This is a show about power that corrupts not through ambition, but through grief, the protagonist doesn't want dominance, he wants to undo loss, and the blade keeps offering him a way that costs more each time he takes it. The animation during cultivation sequences has weight that most action shows spend their entire budget chasing. It moves like someone learning to live with a ghost in their bones. By the time you understand what the sword actually wants, the show has already spent three arcs convincing you the wielder was in control. He was never in control.
Daojian Shen Huang is a ONA from Xing Yi Kai Chen.