The story of Excalibur 2 library cannot be triggered, but it is not in place. Starting point of the mission: Tia Chamber of Commerce in Avari-Gretmund Flight Deck-Residential Area. Mission conditions: Unlock Lv4, the key tie reward of Bache, and get the mission for the mercenary group. It is said that it will trigger the plot near Philsophy Library in the northeast of Tusole, Wang Du.