When the "Iver" in the game obtained this book, he must not have had a single Phantom Demon Card on him.
Or rather, he must have realized that this book contained some kind of "means to obtain power," and only then begun making cards to serve as keys for unlocking the book's hidden power.
A long, long time ago, when Iver had just started making cards with Shadow Demons, a doubt had actually arisen in his mind: Why could he make cards so easily? Although as long as one had the right "knowledge" and the materials were fine, it was possible to make cards even without a sufficient level of power—that was the special nature of rituals. They possessed the trait of being "passed down from generation to generation," providing the possibility of "the weak overcoming the strong." This was a symbol of the Serpent Father's origin.
But what ordinary people could replicate were only rituals that already existed.
If one wanted to establish an entirely new ritual, one had to be a Ritual Mage. Only Ritual Mages could deconstruct Path Power, precisely capture the mystical origin, and achieve symbolism through various miraculous techniques.
That was also why Iver had conducted experiments using only Shadow Demons at the time, finally confirming that he could save Yulia through this method.
If this was a ritual developed by Jacob... then everything lined up! Never mind the "Iver" from the game's original plot. From the very beginning, this world's Iver had been him. Although he had lost his memories, he still possessed a mature soul. The fact that he had been able to take care of Yulia like an adult from a very young age was proof of that.
—Yet after Iver came of age, he had suddenly begun to crave knowledge of