"What is this?" Wang Yu asked in astonishment, pointing at the tome that Avia had brought out. He could guess roughly what it did, but he couldn't resist asking anyway.0

"Well, it's the spellbook from that game you told me about. I designed this book so you can cast spells more flexibly," Avia explained.0

"I've had the idea for a while, but I could only make this prototype after gaining access to my teacher's laboratory."0

She opened the heavy, book-shaped magical device. Though it resembled a book at first glance, the inside revealed a compact metal compartment.1

It was roughly made, with visible patches and welding marks. There were multiple recesses within, all empty save two, which contained something like cards.0

"The computer chips you told me about gave me a lot of inspiration, Wang Yu. Most magical equipment in use today are single-use, charge-based tools. They take a long time to recharge, like the Fireball Ring I designed before—it needed to be recharged after every use."0

"Right, that's a common flaw with magical equipment. You'd need something like a magical array with a power source to have things run continuously," Wang Yu agreed.0

"But, Wang Yu, if we can outfit a small ring for spellcasting by engraving magical circuits into it, why can't...0