The power of the "Heavenly Lightning Graduation Certificate" could reduce the duration of the "Celestial Killing Light" by nearly 40%.
However, Song Shuhang estimated that when facing the heavenly tribulation, the "Heavenly Lightning Graduation Certificate" might be slightly less effective. After all, the heavenly tribulation was different from other challenges. Besides the main lightning tribulation, the heavenly tribulation had various other attributes, like the cute inner demon tribulation.
Moreover, the Fat Ball's research on heavenly punishment and heavenly tribulation, if used properly, could at least reduce the duration of the heavenly tribulation by one or two levels.
