Book of Omega

The Book of Omega (オメガの書籍, Omega no shoseki), also known as the Book of Chronos (クロノスの書籍, Kuronosu no shoseki) is a Grimoire that was created by Omega. The Grimoire is capable of altering and manipulating the fabric of time, and allows the user to use time-base magics, and Slayer Magics.