"Let’s not talk about this, Saleen. We are going to learn how to write magic books today," Lex said. She knew that even if Saleen was able to sway his mentor and subsequently make an impact on Alchemy City, the place where Jason had been trained, now was not the time to discuss it.
Speaking of magic book writing, it was an area that Saleen was not well-versed in. People who possessed the ability to write magic books were likely those who had inherited the knowledge through their magic lineage. Needless to say, it would be very hard for Saleen or even anyone at all to find a book on this subject. Had Jason stayed in Alchemy City, Saleen would have been able to learn it alongside Jason. However, when Jason left, he had merely been a Grade 1 mage and was thus unqualified to teach Saleen.