C1052 Unravel the nine palace map

The three major sects, who had never had any direct contact with each other, had actually joined hands. Their target was only these four youngsters, who were about 20 years old on average. They shouldn't have spent so much effort just to steal that magical necklace, right? Could it be that this matter was not related to the necklace alone? But if it wasn't purely because of the necklace