Jhen believed it would be better for William to start with that book.
"The book you have in your hands, the same one that Kier has, is more advanced. It's better to start with the fundamentals to ensure your future isn't compromised," she said.
Learning magic was a step-by-step process, and people needed to progress through each stage before moving on to the next. William understood that this was the best approach, especially when learning a new type of spell, like he was doing.
The Basic Demonic Manual of Fire was the first volume in a series of books that included the foundational meditation techniques, basic fire spells, and essential body training. Unlike ordinary mages, demons focused on improving their physical bodies as well.
In fact, many mages, who were supposed to have weaker bodies, actually possessed physiques even stronger than those of body-enhancing mages from other continents. This showcased the unique power of demon mages.