Hunter X Hunter the Last Mission

The strongest Hunters that once existed in the Hunter Association were split into two groups, the latter being called the "Shadow", and each walked down their respective paths. After facing discrimination and massacre, the Shadow begins moving in order to massacre all Hunters! After a brutal attack from the Shadow, Killua is injured and Kurapika is almost dead. What is the real goal behind the attack on all the Hunters? Now that the crimes of Net...