Han Sen put a drop of his blood on the Western King Sword. The blood didn't spread and blend into the metal, however, and it just remained a droplet upon the surface.
"I can't believe this isn't working!" Han Sen cut his wrist and bled some more of his Real Blood over the sword, and went at it until it was entirely painted red.
Even after rubbing it in, it didn't work. Han Sen put the Western King Sword aside, hoping the Real Blood would do something in time.
If there was a will there was a way, and Han Sen wasn't keen on giving up just yet. That was one of the four crystal king armors, and he didn't think there'd be a fifth in existence.