Attack on Titan's Omni-Directional Mobility Gear, more commonly known as ODM gear, is the weapon of choice for the soldiers behind the walls. Humans designed and developed the gear to help fight against the Titans. The gear allows the user to fight off against the man-eating giants in a 3D space rather than in the 2D space on the ground. Learning to control, manipulate, and excel with ODM gear takes training and years of practice.