Testament

Testament (学習装置 （テスタメント）) is a machine used to install information into a human's brain. Notably used for the Sisters Project under the supervision of biopsychologist, Nunotaba Shinobu.

Appearance
The machine appears in a form of a capsule, large enough for an ordinary middle school girl to fit in, though there are probably other variations of size depending on the person. The seal for the machine is transparent, and observers from the outside can fully view the recipient. Inside, the subject wears a helmet which is connected to tubes and wires, though another Testament machine showed the helmet covering the eyes and ears of a Misaka clone which probably produces the same effect. Outside the capsule, several tubes and wires are connected to the machine and probably leads to the bank where the information to be installed is stored.

Use and Operation
The subject lies down inside the apparatus, here, the helmet is inserted unto the subject's head. By sending out electrical signals into the brain, the machine can input a large amount of information in a short period of time and affects all five senses of the body. Using the machine, information such as speech, logic, motor functions as well as the personality and emotions of the subject can be installed.

Level Upper Arc

 * Main article:Level Upper Arc

The Testament machine is first mentioned by Kiyama Harumi during the Level Upper Arc, where she mentions its existence as a comparison of the Level Upper to Uiharu Kazari.

Sisters Arc

 * Main article:Sisters Arc

The machine is prominently featured in the Sisters Arc. Here, the machine is physically seen for the first time and how it is used to install information into Misaka 9982.

Three Stories Arc

 * Main article:Three Stories Arc

The machine is mentioned by Yoshikawa Kikyou as a requirement as so the virus installed into Last Order – the command center of the clones – can be removed as it will send a command to the Misaka Network to kill all humans. However, due to time constraints, Accelerator is forced to use his vector powers to mimic the Testament machine, and remove the virus by rewriting the code.

Academy City Invasion Arc

 * Main article:Academy City Invasion Arc

With Vento of the Front invading Academy City and utterly crippling its infrastructure, Aleister Crowley decides that it would be a great opportunity to use Fuze=Kazakiri. Here, he orders Kihara Amata and his Hound Dog unit to capture Last Order to install a virus into her that would force the remaining Radio Noise clones to initiate the activation of the Imaginary Number District and manifest Fuze=Kazakiri into Academy City.

Amata successfully does so, which severely injures Vento of the Front for being a magician upon the installation of the code into Last Order. Though the code remained in Last Order, Index manages to stop it from working by using a song after realizing that the laws that allowed the manifestation of Fuze=Kazakiri could be found in one of her 103,000 grimoires.