In Attack on Titan, humanity finds itself cornered within walls by the seemingly unstoppable Titans. With the discovery that Titans like the Armored Titan possessed advanced armor, the Scout Regiment realized they needed a new type of weapon for combating such foes. Hange Zoe took on the task of developing such a device, creating the Thunder Spear. Drawing from secret technological knowledge preserved by the Interior Police, this weapon was designed specifically to battle the towering forces that once again threatened humanity within the walls.