Reinforce I

Originally the sentient Book of Darkness, this ancient Lost Logia serves as Hayate Yagami’s loyal partner and the creator of the Wolkenritter. Though she first emerges late in Magical Girl Lyrical Nanoha A's, her essence is later reformatted into the diminutive Reinforce II during the StrikerS era. After Hayate reclaimed control from the Book's influence, she renamed the entity Reinforce, transforming a tragic weapon into a reformed companion bound by a new, peaceful destiny.