Margaret said that using the same spell, changing only its effect, and overwriting the original effect was, theoretically, a very effective method.
This was based on one of the most fundamental principles of enchantment spells.
When the same spell was cast upon the same target, its effects did not stack. Instead, the new effect overwrote the old one.
This was also the main reason the Enchantment School had always researched new spells in order to strengthen their effects.
If effects could be stacked at will, there would be no motivation at all to "scale the heights of magic."
They would only need to develop the most basic version, then stack it however many times they wanted whenever they needed a stronger effect.
In fact, for Enchantment mages, casting the same spell ten times in succession on one target was much easier than directly casting a spell ten times as powerful.
Margaret had not expected her words to be of much use.
She just... she just had to say something.
Jia Xiu had finally asked a question. If she could not answer it, her status as a mentor—which was already practically nonexistent—would become even more "superficial."
As for why she had not expected her suggestion to work.
That involved another basic principle of enchantment spells: only completely identical spells could overwrite one another. Even the slightest difference would not do.
Of course, identical here meant that the casting process had to be identical. The final specific effect did not necessarily have to be the same.
For example, with the Enchantment School's classic Suggestion Spell, as long as the casting process remained the same, it could overwrite the old spell, while the specific content of the suggestion could be altered.
Even so, Margaret still did not believe Jia Xiu could learn this