There are 9 legendary weapons for all heroes. Heroes can invite your friend to activate your weapon.
During the event, heroes can login the page to get an invitation code for your self. Heroes can send your invitation code to your friend and invite them to active 9 weapons for you.(Every character only can activate weapon once.)
Heroes can get some reward when you active every weapon. Once heroes activate a set of weapons will receive extra reward.
According to the time of activing a set of weapons, heroes can get some better reward.