Global: I Become the God of Spacetime Swords at Class Change and Crush Everyone

[Class change for all + multiple classes + defending the homeland + leveling up]

Xu Qi'an accidentally transmigrates to a world where everyone changes classes, starting with strange quests and eventually unlocking a hidden class: the Sword God of Time and Space.

After changing into the Sword God class, he collects every famous sword he can get his hands on, including the Xuanyuan Sword, the Chixiao Sword, and the Chengying Sword.