Shi Huang's expression changed instantly. The hardest sword formula to master in the Xiaoyao Sect shouldn't really be the Xiaoyao Sword Formula; at least the Xiaoyao Sword Formula could be cultivated, whereas the Six True Words Formulas had never been successfully mastered by anyone.
At least, in all his years, Shi Huang had never seen a single disciple of the Xiaoyao Sect successfully cultivate the Six True Words Formulas.
Just like that, his previous words had completely backfired on him—he had just been schooled by his own disciple.
Chapter 469