A Patronus Charm was basically the strongest proof that a wizard possessed a sound mind and a normal sense of good and evil.
Anyone corrupted by the Dark Arts, or Dark Wizards who had used the Dark Arts for a long time and harbored nothing but vicious, extreme thoughts, could never summon a Patronus Charm.
Because there was no longer any Pure Land in their hearts.
That was why Vaughn had brought up the Patronus Charm first.
Not only because it was difficult to learn, but also because it was a very useful indicator.
At the very least, Old Dumbledore would be more at ease after seeing it.
When Vaughn left the Headmaster's Office, he had an enormous book in his hands, The Past and Present of Memory Magic.
The title was rather artistic. The person who wrote it had to be a Ravenclaw.
On his way back to Slytherin, Vaughn eagerly began reading it.
The book gave a detailed introduction to the branch of Memory Magic, covering its history, development, and all modern spells known to be related to memories.
Aside from Obliviate and Occlumency, which Vaughn already knew, as well as Legilimency, which he wanted to learn,
there were also the False Memory Charm, Sweet Dream Charm, Nightmare Charm, and so on.
It also explored many spells from other fields that required the involvement of memories.
Alchemy alone included the Pensieve, Memory Orb, Portrait Making, Self-writing Quill, and more. Though it did not provide specific methods of creation, every part that required memories was documented in detail.
"Even advanced Transfiguration requires memories? The process of turning an inanimate object into a living creature and giving it life is actually the process of instilling it with memories, using false memories to imitate a real soul..."
As he read this