When Professor Uther led him through the layers of protective doors, Ron felt a strong sense of unease from the surrounding environment.
The walls of the entire area were made of a black stone as deep as the night sky.
"Void Stone."
Uther noticed Ron's gaze:
"This is a special mineral mined from the eighth level of the Abyss, with a strong ability to absorb and release magic power.
Generally, training room walls may be shattered when faced with the impact of a Dark Sun Level Wizard's power.
But this material can withstand the release of power close to the Great Wizard level without damage."
On both sides of the corridor were rows of monitoring crystals, each recording the surrounding energy fluctuations in real-time.
As Ron passed by, these crystals began to flash different colors of light.
Some displayed stable blue light, while others showed irregular red pulses.
"The energy characteristics of your body are more complex than I expected."
