The Book of the Black was allegedly written "in preparation of the Blackest Night". The caretaker of the book was a former Guardian of the Universe named Scar. During the "Sinestro Corps War", Scar was greatly disfigured by the Anti-Monitor and later corrupted by the Anti-Monitor's evil. In the bowels of the planet Oa, she succumbed to this evil and assumed the name Scar. Scar's insight into the prophecy of the "Blackest Night" was intricately tied to the writings of the Book.