Gefjun Disturber

A Gefjun Disturber is a device created by Rakshata to disable Knightmare Frames. It does this by disturbing the chemical and mechanical processes of the Knightmare's Sakuradite and interior computers and gears preventing movement. It is first introduced in the first battle of Kamejima Island. The Lancelot Conquista was developed with a certain resistance built in, however, it still makes its movement sluggish.

Lelouch, who had several of these devices built onto a train, uses them to paralyze Jeremiah Gottwald by interfering with the Sakuradite in his bionic parts.