"Tell me what you understand about the Undetectable Extension Charm," Professor Murray continued with a smile.
"Yes." Wade grew serious. "The Undetectable Extension Charm is a spatial spell. I suspect it can simultaneously achieve spatial expansion and spatial folding. This spell can be applied to any material—metal, earth, cloth, wood—provided it is a closed, finite space. In theory, the Undetectable Extension Charm can expand a space from finite to infinite, but in practical use, it is affected by all kinds of factors. The most direct are the material, the wizard's Magic Power, and one's understanding of the spell—"
Professor Murray nodded slightly.
Most of what Wade had said could be found in books, but integrating it all was no easy task. What was more, it included Muggle theories and his own thoughts. Written down, it would count as an excellent paper.
It was clear that he had done a great deal of preparation beforehand. This earnest and rigorous attitude was precisely what Professor Murray appreciated most.
"—In summary, the Undetectable Extension Charm is extremely difficult to use and easily abused. Therefore, it is strictly controlled by the Ministry of Magic—"
Wade paused here and glanced at Professor Murray. Then, under the man's smiling gaze, he continued, "The Ministries of Magic in every country have regulations stating that the Undetectable Extension Charm may not be used for private purposes. It may only be used in the production of certain items approved by the relevant Ministry of Magic. At the same time, individual wizards may not possess items enchanted with the Undetectable Extension Charm without the Ministry's approval."
Professor Murray could not help laughing. "Yes—we are now discussing how to violate Ministry of Magic law. But Wade, an Alchemist without an Undetectable Extension Charm suitcase cannot be considered a true Alchemist. Of