Book of the Blue Blaze

The is the true Azure, and also the true BlazBlue.

Information
Hades: Izanami wanted to get the Book, but it was obtained by Ragna the Bloodedge after he killed Yūki Terumi in the end of BlazBlue: Centralfiction, where the two of them were summoned into the Azure Boundary Line after the Forbidden Gate was opened.

Ragna used the Book to rewrite his world, erasing his existence from it as well as restoring everyone who turned into seithr during Doomsday.

Azure Grimoire is a fake Book of the Blue Blaze.

Despite its name, it is not a book.

Trivia

 * The "Book of the Blue Blaze" is localized as "Azure Flamed Grimoire" and "Azure Flame Grimoire".