"Is this really not going to cause any problems?"
Severus Snape looked at the two crystals installed at the entrance to the Great Hall, still sounding somewhat uncertain.
The two crystals were rather large, and as magic flowed through them, they emitted a faint blue glow.
The two crystals resonated with each other, forming an inconspicuous beam of light.
Even if someone noticed this light, they would not react much to it. It might even seem like nothing more than decorative colored lighting.
However, Snape understood Katelyle's plan and thus knew what these two crystal balls were for.
Still, despite the tests they had conducted, there was no way to determine whether they would work on the students.
"Severus, do you really distrust me that much?"
Hearing Snape's words, Katelyle said helplessly, "You have personally experienced our experiments."
"Trust me. As long as they pass through this door, they will inevitably reveal their true forms."
Katelyle was incomparably confident, leaving Snape with nothing more to say.
The entrance to the Great Hall was a place every student had to pass through.
As the bell signaling the end of class rang, the morning lessons came to an end, and students began making their way toward the Great Hall.
Katelyle, Snape, Professor McGonagall, and Dumbledore had already been waiting at the professors' table for quite some time.
Before the students entered, the four of them each placed several drops of specially prepared potion into their eyes.
The appearance of the two crystal balls made the students curious. Some anticipated something, while others ignored them. Just as Katelyle had initially expected, no one paid them much attention.
As one student after another entered the Great Hall and passed through the doors, it immediately became clear whether any of them had been controlled by