The Gran Grimoire is called the "ultimate codex of sorcery" by Romeo Guildenstern, and grants its owner immortality. At first believed to be a book, it is eventually discovered that the entire Valendian city of Lea Monde is in fact the Gran Grimoire. Using Kildean runes, the Kildean priestess Mullenkamp crafted the city two-thousand years ago, presumably making of it a crucial source of power and prosperity for her followers.

The key to unlocking and possessing the Gran Grimoire is the Blood-Sin tattoo on Sydney Losstarot's back.

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