Everyone laughed at Pei Huan, the only useless apprentice in the Mage Tower, who could even draw the wrong runes on the lowest level of light spell. Until the beasts attacked the city and the defense line collapsed, he dismantled the ancient protective spell on the city wall with his bare hands in front of thousands of soldiers——
It's not a repair, it's a direct modification to the nine-ring forbidden spell and divine punishment sequence.
When the world-destroying thunder swallowed up the millions of beasts, Pei Huan turned around and faced the trembling instructors: "The runes you taught... Every stroke was wrong."
