Book of the Blue Blaze

The is the true Blue, 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, when the two of them were summoned into the Boundary Line of the Blue 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 Magic Element during the Day of Ruin by the Embryo.

The Blue Grimoire is a fake Book of the Blue Blaze.

Despite its name, it is not a book.