"Since I'm the one who'll be in charge of the teaching details..." Wizet said curiously, "Headmaster Dumbledore, then why did you ask me to stay...?"
"The magic that helped Harry ease his pain..." Dumbledore asked with great interest. "If I remember correctly, it was called the 'Silent Wound Charm'?"
"Yes!" Wizet took out a notebook from his pocket. "It's a spell I invented after researching 'consensus' magic."
Dumbledore pushed the plate of cookies forward. As though he had struck a deal with Wizet, he opened the notebook Wizet had slid over.
"Taking 'if it hurts, then cry out' as its principle..." A smile played on his lips. "And turning that principle around..."
"It becomes a spell that eases pain... The difficulty of casting it is rather low as well... What an interesting conclusion, what an intriguing line of thought!"
"The incantation is 'Drowsiness Spreads.'" Dumbledore glanced up at Wizet before looking back at the contents of the notebook.
"The principle is 'yawns are contagious'... It can trigger a chain reaction of mental haziness, guiding people into a light sleep..."
"This often happens in History of Magic classes..." Wizet explained with a smile. "Of course! It also happens easily in the common room after ten at night."
A portrait behind Dumbledore spoke up. "Albus, what is this spell called?"
"Dilys..." Dumbledore replied. "This spell is called the 'Mass Hypnosis Charm.'"
The "Dilys" Dumbledore referred to was Dilys Derwent. Not only had she been the Headmistress of Hogwarts, but she had also been a healer at St. Mungo's Hospital for Magical Maladies and Injuries;
Dilys Derwent had made tremendous contributions to St. Mungo's. Therefore, her portrait hung not only in the Headmaster's Office, but also on the wall of St. Mungo's waiting room.
"Mass Hypnosis Charm? Silent Wound Charm?" Dilys Derwent pressed.