Testing the sword edge is very simple.

One only needed to go up, press the crystal sword coffin with the palm of one's hand, and if one had a bond with the sword, one could cause the crystal sword coffin to produce a strange sound, releasing the phoenix sounding divine sword, and then hold the divine sword and perform moves without being rejected by the divine sword, and one would be considered to have a bond with the sword.

It sounds nonsensical.

But this was, after all, ...