In fact, when Vaughn had first used the Spell Development Module to develop the Multispectral Vision Charm, he had never considered applying the spell to acoustics.
It was not until he acquired a large number of artificial wizard specimens and studied them with the Vision Charm that the subtle interference human organs' natural frequencies caused to light waves awakened some relatively obscure knowledge from his past life, buried deep in his mind.
Acousto-optic coupling!
The acousto-optic effect!
Ultrasound!
Infrasound!
"Nothing can escape vibration—" Vaughn stepped out of the strange sphere and saw Pandora not far away, still standing amid the ruins with her wand raised, as well as the Magical Congress of the United States wizards diving down above her.
Vaughn's thoughts raced.
Everything in his field of vision slowed to an extreme, as though frozen in place. But Vaughn knew full well that it was not because time outside had truly slowed.
Rather, his eyes were receiving and processing light faster, and his thoughts had accelerated as well.
The Multispectral Vision Charm had evolved from the Super-Sensory Charm. The Super-Sensory Charm was originally a spell that used magic to enhance the body's senses in various ways, and the Vision Charm had inherited similar functions.
Of course, that also brought certain burdens.
As he swung his wand and cast the Infrasound Charm, Vaughn felt his eyes begin to ache and itch, while a stabbing pain spread through his brain.
That was the result of them operating at high speed.
But he could still endure it. If he wanted to use sound waves, he had to ensure he could observe them.
Within his vision, a ring of ripples edged with an indistinguishable color quietly spread outward. It was formless and intangible, impossible to perceive.
Only those who truly understood it knew