The Three Hundred Sixty Wall Clear Formation was the protective grand formation of the sect Qin Fengming had belonged to in the Human Realm.
Back then, he had obtained the complete formation arrangement method and incantations for this protective formation. After studying it carefully, Qin Fengming believed it was more than capable of withstanding a round of attacks from Yin souls.
Of course, if he wanted to withstand and annihilate attacks from tens of millions of Yin souls, even Manghuang Mountain's protective grand formation absolutely could not do so.
Although it could not annihilate all the tens of millions of Yin soul ghosts, the Three Hundred Sixty Wall Clear Formation could certainly kill a considerable number of them. If it could cooperate with the formation already here, Qin Fengming was fully confident he could easily withstand this soul calamity.
If they relied solely on the original formations, they could indeed kill some of the Yin souls, but they would still need numerous Immortal King-realm cultivators to form a formation and eliminate the vast numbers of Yin soul ghosts that broke free.
Deaths in the ensuing battle would naturally be unavoidable.
Although most of those Yin souls were merely low-rank ghosts, an Immortal King cultivator caught among hundreds or thousands of Yin soul ghosts would not have very good odds of surviving.
Looking at the incantation runes listed on the jade slip in his hand, Bao Chengtian and the other five Immortal Lord cultivators all saw their eyes blaze with light, their faces filled with delight.
To a formation grandmaster, a set of powerful formation incantations was no different from a cultivator suddenly coming across a precious spirit herb.
After handing the formation jade slip to the six men, Qin Fengming did not linger. With a movement of his body, he