It was based on this principle, reversing Yin Yang and Five Elements, that he realized the reverse application of the Nine Ceremony Great Formation.
In its direct application, the Nine Ceremony Great Array joins heaven and earth to bless oneself.
By the same logic, in reverse, it is the array joining heaven and earth to suppress the enemy.
The former can elevate a Void Immortal to True Immortal status, and the latter can press a True Immortal down to Void Immortal, or even cast them down to the mortal world, falling below the Tribulation Realm.