Demon Banishing Spell.
A very simple first-tier spell, its effect is to shield the residual magic power attached to the body from the outside world, so that subsequent spell learning and research can be smoother, eliminating external interference, similar to disinfecting before entering a laboratory.
Of course, in reality, no mage would actually do this.
The error brought by that little bit of weak external magic power was almost negligible. Only Malvin alone would have such a mandatory requirement for his students.
And Reji, who had followed Malvin for a long time in the game, this rule had become a natural habit.
"Teacher, you should have noticed too, the threat of the Demon race is approaching."
Reji got straight to the point after entering the room.