The spatial grid directly stores Chen Fei's most powerful move, which is the method he initially experimented with, utilizing another aspect of the spatial grid.
Chen Fei discovered this method when he was still a Body Tempering realm martial artist. However, back then, Chen Fei didn't use it because, after all, his techniques at that time were not strong enough to be of much use.
Moreover, there was only one spatial grid at that time, used to store Chen Fei's various belongings, which was far more appropriate than storing a technique with relatively weak power.
But now, with an additional spatial grid and Chen Fei's increased attack power and recovery ability, he can naturally use one spatial grid to store a technique.
This technique can become Chen Fei's killer move at critical moments.