So as to redouble the effort when choosing a speciality later on!
This benefited Rein, the 'wild' Wizard Apprentice, immensely.
Soon, Rein figured out how to use the 'affinity testing' crystal ball.
The method was simple, only requiring him to pour his spiritual power into the crystal ball and earnestly perceive the surrounding mystical side-energy particles.
After a moment's thought, Rein decided to test it immediately. Thus, he began to hold the crystal ball with both hands, closed his eyes, and concentrated his spirit.
As Rein's spiritual power flowed in, the crystal ball quickly emitted a soft white light, and at the same time, different colors of light started to swirl within the previously clear crystal ball.
A few seconds later, the light gradually stabilized.