Elder Shusun was startled at the sight. He immediately realized that this was likely one of Zhang Yu's avatars.
Yet he did not feel that an avatar would be any easier to deal with. On the contrary, he was greatly alarmed. For the moment, he could no longer spare attention for attacking with the formation's power, hurriedly urging everyone within the formation to defend with all their strength.
The one Zhang Yu had sent to block the grand formation was his Fate Seal avatar. Apart from lacking mystical anomalies and being unable to employ certain higher-law divine abilities, it could almost be considered equal to Zhang Yu himself.
Elder Shusun's nervousness was not without reason. Back then, when Guan Chaosheng's Primordial Spirit had flown out from the void domain, it had suppressed twenty or thirty Celestial Xia Profound Venerables within the opposing grand formation until they could not move. Now that Zhang Yu's Fate Seal avatar had arrived, suppressing this formation would naturally not be difficult. If he continued pressing it, it would only be a matter of time before the entire grand formation was breached.
Guan Chaosheng also noticed that the formation was being suppressed by Zhang Yu, but he was not especially afraid of it being broken.
The several elders were all at the Void Lodging Realm and would return sooner or later. Once those True Persons were slain, they would immediately be cast into the Void-Refining Calamity Sun as sacrifices, becoming part of his strength. Thus, while this would weaken the Vast Yang Sect's overall power, it would instead bolster the rise of his own strength.
Of course, though this method was somewhat cruel, it would not be used outside wartime. Looking at it from the other side, once the enemy realized this, they would not dare