Reinforce

Reinforce is the Master Program of the namesake Unison Device. She is originally the nameless Master Program of the Book of Darkness (known as Tome of the Night Sky in Ancient Belkan era before corruption), a Lost Logia and an intelligent creation of Belkan mages whose names have been lost to time. The Book's final master Hayate Yagami has reprogrammed the Unison Device and "gifted" this Master Program a new name, i.e. Reinforce.