C117 The death of the prodigy(part i)

It was just that the longsword contained a small sword. When the longsword met an obstacle, it would draw out the small sword and put the opponent to death. It was a weapon that was completely necessary for a killing battle.

But why do we rarely see a wuxia novel or wuxia movie in which we see a useful mother sword, or a decent protagonist, or a useful mother sword as a weapon? In fact