Black Box

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

History
Some time prior to the Third Period, gods created the magic tool. Sometime after the death of Allen Avadonia on December 26, EC 500, Sickle 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 the 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. Sickle later checked on the boy in EC 549 before closing Black Box again. Once he reawoke, Allen continued to absorb information from Black Box over the centuries. 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.

Mechanics
As a magical device, the Black Box's main ability was to absorb and course information from the Third Period. Large enough to hold a single individual, the information it absorbed would in turn be learned by the individual should they stay inside. Aside from this, the Black Box also had a teleportation ability, allowing the user to instantly apparate at a desired location in the Third Period. Sickle was also capable of summoning the Black Box. The Black Box could also only be opened by the Golden Key.

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.

Curiosities

 * 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.
 * Irregular 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 Black Box, 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 (first appearance)
 * Seven Crimes and Punishments (story)
 * Seven Crimes and Punishments (album)