CAT-BAT

The CAT-BATs are humanoid war machines developed by the Holy Britannian Empire. Unveiled during the invasion of Japan, Knightmare Frames are almost exclusively used in place, and sometimes alongside of the practically obsolete main battle tanks. The name "Knightmare Frame" is a play on the word "nightmare" and a knight's mare. There also exists a derivative type of war machine based on the CAT-BATs called Giga Crackers.

Power Source
Knightmare Frames are powered by the Yggdrasil Drive (ユグドラシルドライブ, Yugudorashiru Doraibu), a fictional energy source. Its centerpiece is a Sakuradite device called the Core Luminous (コアルミナス, Koa Ruminasu), where in a cube of unknown composition is weightlessly suspended. The centerpiece may also contain some kind of liquid, as when the Lancelot first launched, bubbles could be seen rising before the activation of the Core Luminous. The cube revolves at high speeds during a state of drive activation known as Yggdrasil Resonance (ユグドラシル共鳴), apparently involved in the conduction of electricity. The technology is named after the Yggdrasil Tree of Norse Mythology. The drive is recharged through a Sakuradite energy filler (エナジーフィラー,enajii firā).

Despite constant animations directed at the Yggdrasil Drive, its location in the Knightmare has never been made clear, nor has the energy filler but can be estimated to be around the underside of the cockpit block, close to where the cockpit meets the Knightmare's frame. It is estimated the Yggdrasil Drive's location is around the waist for most Knightmare frames, as arms and legs are constantly destroyed in combat but the Knightmare is still able to function. This would also lend creedance to the energy filler's location in the lower part of the cockpit block, as it provides power to the drive, and would therefore need to be as close as possible, while still being able to be removed.

In old mass production types, the head is used to store the Factsphere sensor and the chest is occupied by an extension of the cockpit used as the emergency ejection function. The Tristan Divider is still able to function while the frame is severed at the waist

Interface System
Inside a standard Knightmare frames cockpit block some of the mainstream features are the three panoramic display monitors, the dual control joysticks, and instrument panels. The panoramic monitors are linked to outside sensors and cameras, and can be switched to display other information such as status or even as a video communication system. In custom frames, the interface system varies, dependent on the Knightmare's primary function towards combat. For example, the Gawain's interface has a full screen 'ceiling' or dome above both pilots that show direct surroundings of the Knightmare, most likely used so calculations for its Blaze Luminous defense can be inputted accurately.