The Gold-Back Mountain-Cutting Saber is Zuo Tiancheng’s signature weapon in the Xing Tang strand of the broader Sui–Tang heroic tradition. Its proper name and stable character association justify a distinct Object identity rather than a generic saber node.
The weapon reinforces Zuo Tiancheng’s recognition as the Golden-Saber General: the nickname and the named saber point to the same martial image without turning Golden Saber into a global alias.
This Subject records the named saber only. It does not introduce a spear or shuo as a parallel principal weapon, and it does not merge with unrelated saber Subjects.