Book of Ars Goetia

The book of Ars Goetia is a book that list 72 demons of immense power. Ultimately, it was sealed away in a void like dimension called the Shattered Isles. Many black mages believe it can control all demons listed in it, but it can't. However,it can summon them. Some of the demons have been captured as demon souls. Sinbad of Sindria has captured 7 of them.

Creation
Like the book of end, this book is a symbol of Darkness. Nobody knows of its origin of how it was created, but those who were a witness to it know the sheer amount of malice it gives off.