Item from Mahou Shoujo Lyrical Nanoha by Masaki Tsuzuki / Seven Arcs
The Book of Darkness's true name — the original, uncorrupted magical storage medium it was before tampering destroyed its Defense Program, and the name Hayate gave it after reprogramming it clean.
The Tome of the Night Sky is what the Book of Darkness should always have been. After reprogramming, Hayate used the original Tome (the remaining non-corrupted components) briefly before Reinforce destroyed herself. She then recreated the Tome in autumn 0069 based on the original's design. The distinction matters to the franchise: the Book of Darkness is the tragedy, the curse, the thing that killed Clyde Harlaown. The Tome of the Night Sky is what Hayate made from it — the book's true name, restored. This is the kind of thing Hayate does.
A brown tome — visually similar to its corrupted form but in a clean storage form without chains. Hayate's magical storage vessel post-A's, containing her compiled spellwork and data related to Unison with Reinforce Zwei. It is magically stored within Schwertkreuz for convenience.
Also known as: Buch der Nachthimmel, Yami no Sho, Tome of the Night Sky