Mages could only cast spells that were at most one grade higher than their own. After casting the spell, their mental strength and magic chords would all be wiped out. As a result, mages' learning speeds were greatly reduced and many that were not guided by any teachers would often lose their way.
If a mage cast a spell that was two grades above their own, the knowledge they gained would more than make up for the loss in time. Most wealthy mages would be able to train better even without any teachers.
The prices of such scrolls would always remain high. Most mages that possessed such scrolls would usually choose to study them and could not bear to use them. Only someone like Saleen would have no qualms using them since his intention was only to sign a contract spell.
The problem was that Saleen used the scroll because he had no other choice. On the other hand, Isabella was ready to use it for an unimportant victory.
