Caster laughed loudly as if celebrating his victory. As he spoke, a thick book appeared in his hands. The cover of the book was wet and glistening and, unbelievably, a piece of human skin was placed on it. It is only an ordinary book by the look of it, but with Saber’s lightning-like senses she could tell that massive amounts of prana surged around with the book as its center and expanded outwards. Without a doubt, that book is Caster’s Noble Phantasm.

“This is the magical book my friend and ally left for me. I obtained the means to lead armies of demons using this book. What do you think? Is it that no other army can stand up to the majesty of my demonic army?”

- Fate/Zero: Act 6, Part 2