[Bonus chapter]Forethought

Tyler, being unconvinced, flipped through the entire book and finally discovered the secret on the back cover.

On the back cover was a line of text:

"Please infuse magical energy to generate your exclusive spell and magic circle."

It turns out that magic books require an infusion of magical energy to reveal the magic construct and corresponding magic circle.

Tyler imagined the sensation of releasing his skill and successfully infused magical energy. A few seconds later, a line of text emerged on the first page of the book.

"Exclusive content generated for you."

Tyler flipped through a few more pages, and indeed, there was now text and illustrations.

(So that's how it works. Once infused with magical energy, the book becomes exclusively mine.)

(As it contains exclusive magic constructs and magic circles, stealing the book would be pointless for others.)