Anyone with hope of advancing to the ninth circle is a key cultivation target of the congress.
The congress does not want to create additional obstacles for wizards breaking through to the ninth circle due to a knowledge monopoly.
But the cost of obtaining a free formula is the requirement to take an oath.
The content is roughly about never betraying the congress, betraying wizard civilization, and so on.
The case of the traitor of civilization, the Dark Emperor Asta, is a precedent.
The congress exercises extremely strict control over the channels for advancing to Grand Wizard.
In principle, Levi would not betray wizard civilization.
But his top priority is always his own safety.
If faced with some irresistible force, he cannot guarantee that he would die for civilization.
Therefore, his principle is never to take those oaths that might dig a pit for himself.
Triss mentioned that the Old Witch advanced to Grand Wizard with formulas provided by the congress.
