The "Thunder Cage" is hailed as the most successful attempt at electrifying a technology used by the Ancestors. It is a combination of the prototype of Bunny's suit technology and a submachine gun. This firearm, considered Albion's strategic weapon for the next generation, converts kinetic energy into electromagnetic force, which is stored in a specialized battery. Once the energy reaches its critical state, the user can use a Sub Attack which releases the energy in one powerful burst. The power of this sub attack influenced the weapon's official name. The Magisters said it looked like trapped thunder being released, leading to the weapon being called the "Thunder Cage". Keep in mind that as the firearm's internal devices function independently from Bunny's Arche ability, there is no additional effect when used by Bunny.