Black Box

Black Box was a magical device used for transportation and collecting information. Developed by the gods, the device was utilized for learning and quick movement when needed.

History
At some point prior to the creation of the Third Period, the gods created the magic tool. Sometime after the death of Allen Avadonia on December 26, EC 500, the sun god placed the dead boy inside Black Box and left it there in the fields of the Heavenly Yard. Allen resided inside while learning about the ground world's history and mechanics as the sun god instructed.

When the former chamberlain requested Sickle to interfere in the Third Period to protect his sister from Clarith in EC 505, the god complied and showed him how to use Black Box to quickly apparate to the Lucifenian Coastline. Later that year, Allen again requested to leave in order to interfere with the battle between Irina Clockworker and Yukina Freesis and Germaine Avadonia. After Allen returned, he grew tired from the numerous visits and slept inside of it. Sometime after his death in the EC 530s, Held peeked in the box. Sickle later checked on Allen in EC 549 before closing Black Box again.

Once he awoke, Allen continued to absorb information from Black Box over the centuries. On January 30, EC 611, Behemo communicated with Allen via the box's microphone. In EC 998, Sickle opened the box and allowed Allen to briefly leave before the boy used Black Box to apparate to the destroyed Millennium Tree Forest. After reviewing the ground world's history by meeting the seven demon contractors, Allen returned to Black Box before once again being greeted by Sickle.

Mechanics
As a magical device, Black Box had a teleportation ability, allowing the user to instantly apparate at a desired location in the Third Period by pressing a switch inside the box. The box was also installed with an akashic recorder, allowing it to record information about an entire world during a certain period depending on its settings. Large enough to hold a single individual, the information it absorbed would in turn be intrinsically learned by the individual while they remained inside the device.

To secure the device, Black Box was installed with a keyhole in the center of its side and could only be unlocked with a unique golden key. An emergency encryption protocol was also included in the design, allowing a user locked inside to escape by inputting the correct password, opening the device. A wireless microphone was also stored within Black Box and could be accessed via a switch hidden at the bottom of the device. The microphone functioned as a transmitter for communication with the inside of the box; it also functioned as speaker for the user to hear anyone inside the device. Black Box also had a floatation ability for easy transport and could gravitate higher and lower at the owner's will.

Users

 * Sickle
 * Allen Avadonia

Conceptualization and Origin

 * Black Box shares it name with the scientific term "black box", referring to a device, system, or object where its input and output effects are observable but its inner workings are unknown.
 * It may also be inspired by the "black box", a device in airplanes used for collecting and recording flight information.

Curiosities

 * Seth Twiright is stated to have created a device called "Black Box Type S" and had it installed in the heart of a stuffed cat toy utilized as a body by Irina Clockworker.
 * When developing a "music box" following the Levianta Catastrophe, Kiril Clockworker is described as only having a dirty, black box in his hands.
 * Abyss I.R. placed one of the Four Mirrors of Lucifenia in a similar small, black box she buried in the sand to be found by Prince Alexiel and Princess Riliane.
 * When Kyle Marlon awakes in a mysterious place and confronts the Demon of Gluttony and Ney Marlon, his location is described as being the inside of a large, black box.
 * A mysterious boy portrayed in Re_birthday is stated to be inside a similar large, black box; in Evils Kingdom, Ma states the "black box buried in the sand" would never be found.
 * The firing device for the Punishment weapon used by Nemesis Sudou is also referred to as a black box; like the magical tool, Punishment is also activated by inserting a golden key into the black box.

Appearances

 * Waltz of Evil: The Deadly Sins of Evil Guidebook
 * Heavenly Yard (story) (first appearance)
 * Seven Crimes and Punishments (story)
 * Seven Crimes and Punishments! (non-canon appearance)
 * Seven Crimes and Punishments (album)