Book of Darkness

Book of Darkness
Book of Darkness
Device profile
Other names	Buch der Dunkelheit Tome of the Night Sky
Master	Hayate Yagami
Gender	none
Language	German
Classification
Magic system	Ancient Belka
Type	Lost Logia / Unison
Production
Japanese name	闇の書 (Yami no Sho)
First app.	A's (ep.1)
Last app.	A's (ep.13)
Voiced by	Alexandra Haefelin
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The Book of Darkness (闇の書 Yami no Sho, Ger. "Buch der Dunkelheit") is an ancient Lost Logia that had been under TSAB investigation several years prior to the events of Magical Girl Lyrical Nanoha A's. While originally a benign storage medium under the name of "Tome of the Night Sky" (夜天の書/夜天の魔導書), tampering by curious mages at some point in the past caused its Defense Program to be corrupted, resulting in the book becoming parasitic.

Appearances

The Book of Darkness appears in A's only. It first appears on Hayate's bookshelf in chains.

The Book of Darkness may be more accurately described as a collection of artifacts and technologies. In addition to the Book itself, which is a storehouse for stolen knowledge and spells, it also includes different components. The whole Unison Device is reprogrammed and renamed upon Hayate's awakening in A's episode 11. See the details below.

Functions

Unless the Book's pages are filled with Linker Cores, the Master Program can only communicate with her master telepathically. Full (non-material) manifestation of the Master Program's personality is possible after at least 400 pages have been filled. The complete physical manifestation and Unison Device functionality are only accessible after all 666 pages have been filled.

Components of the whole set of Unison Device, before and after the reprogramming are as follows:

Component	Before reprogramming	After reprogramming
Guardian Knight System (守護騎士ヴォルケンリッター システム)	Their existence started since the first awakening of the Book of Darkness in the past. They collect mana for the pages and protect their master.	Upon the recovery of their Linker Cores, they are separated from the Book of Darkness, thus do not need to be destroyed together with Reinforce.
Master Program (管制人格マスタープログラム)	The Master Program is "the will of the Book of Darkness" (闇の書の意志 Yami no Sho no Ishi). She is responsible for mana-control and ignition of the unison with the Book's Master.	Separated from the Book of Darkness and continued to be the Master Program of the new Unison Device "Reinforce".
Defense Program (防御プログラム)	The Defense Program is capable of regenerating the book infinitely. It was originally designated to protect the master and the Book content, as well as to back-up collected data.	The only part of the Book of Darkness that was not incorporated into Reinforce. Even upon its total destruction in A's episode 12, it would have still recovered in a few days, had Reinforce (its "root") no self-destructed.
The Book	The Book itself has 666 pages and collects data. Upon completion (and unison with its Master), it becomes a storage, serving as a complement to the Master Program.	Same as the Master Program, the book becomes part of the Unison Device "Reinforce". The book was destroyed along with Reinforce, and Hayate made a new Tome of the Night Sky, using it as a storage medium for her spells.
The Staff	The existence of the staff was not known prior to Hayate's reprogramming of the book.	Appears as (or becomes) a part of the Unison Device "Reinforce". No name was given to the staff in any media. The staff was likely to be destroyed together with Reinforce, and Hayate made an identical staff named Schwertkreuz.
The Fragment	N/A	The sole inactive piece remaining after Reinforce's destruction. It might have become part of Hayate's new staff (see Schwertkreuz).