The Codex Gigas is a medieval bible that was handwritten by a monk. He supposedly made a deal to write the entire thing in one night. Such an accomplishment could have only been the work of the Devil, some say.
On the contrary, the book was written with the help of the divine. As such, the Codex Gigas has been written with many divine codes encrypted within the text. These forms of magic range anywhere from being able to summon angels, to divine protection, to be able to see through the eye of God.
This piece will bring you an elevation of mind, but only when you're wearing it. It will recreate whatever Bible you are reading into the Codex Gigas and will allow you to see and acquire the magic that has been written into this sacred book.