Vassal Book

Titles

 * Vassal Wielder
 * Vassal of the Book Hero
 * Book Hero

Owners

 * Kyo Ethnina (deceased)

Abilities
Although its specific abilities haven't been shown the Vassal Book, it is the first vassal weapon to have shown a small sense of sentience as seen when it contacted the other vassal weapon users to kill its current user.

(information to be added later)