Fang Chen Has started the extraction of the cultivation technique from the swords and as he has connected his spiritual energy the three swords has started to combine and have become one.
After becoming a single sword he continued to supply the spiritual energy with the help of a Martial spirit and the system informed him that the system has already converted him to a swords user so he need to continue to supply spiritual energy for the cultivation technique.
So Fang Chen continued and as he was supplying the spiritual energy cracks have started to appear on the sword and slowly slowly the sword was destroyed and after half hour only as scroll was there the swords has completely disappeared.