After a new spell was developed, it often required a long period of refinement to streamline the incantation. Sometimes, a practical spell had to undergo years, decades, or even generations of refinement before it could suit the general public and become widely spread.
Vanessa's research into the Extraction Curse had also made some progress. She had developed a technique that enhanced casting accuracy, which Anduin called "Precise Control." It required strong Magic Perception and control to perform, and currently, only some senior students in the Spell Club could cast it successfully.
Anduin felt that this Casting Skill was extremely valuable and could even be applied to many other spells. His Levitation Charm had previously advanced into an extraordinary realm, and his mastery of this technique had certainly played a part in that.
Anduin had already decided on his spell research topic: "Development Concepts and Applications of Sonic Spells." First, he had already mastered the sound-related spells Loud Voice, Whispering Spell, and Muffling Spell. Second, the relevant magical scripts and runes were not complicated, and he had records of all of them. Quirrell's Amplifying Hearing Spell was also a Sonic Spell, giving him something to reference.
He planned to explore two directions. The first was Ultrasound. By taking advantage of its high frequency and strong directionality, then imitating bats, he hoped to develop a spell capable of echolocation. Once cast, it would be like deploying a directional radar, helping him identify his surroundings and locate enemies. Even someone using the Disillusionment Charm could be found.
The other direction was Infrasound. Powerful infrasound had great destructive force and penetrating power. When received by the human body, it could cause symptoms such as dizziness and nausea; at sufficient intensity, it could even be fatal. If he could develop a spell that made use