"Bang!" By the time the square gong broke through Mo Wuji's domain and landed on Mo Wuji's chest, this black-robed Grand Emperor's life force had been completely sucked away by the Wheel of Life and Death. Before he died, he saw a trail of blood form on Mo Wuji's chest. At the same time, he saw six other Immortal Emperors suffer the same fate as him; they all perished under Mo Wuji's Half Moon Weighted Halberd.
This person's too strong. This was this black-robed Grand Emperor's final thought.
Mo Wuji simultaneously used three sacred arts: Grand Desert, Winding River and Wheel of Life and Death. In a short time, he killed seven Immortal Emperors, including the black-robed Grand Emperor. He, himself, received a deep scar on his chest from that black-robed Grand Emperor's square gong.
It could be said that if not for Mo Wuji's strong physique and his Grand Desert's trap array, that square gong could have ripped him in half at a single go.