Mou Wunu's heart sank; the Mou Family did not have any formation masters of a high caliber here. The Immortal-Slaying Illusion Killing Formation was a defensive formation of the Mou Family, which had long been set up and could be controlled simply with the Array Flags; it didn't require extensive knowledge in formations.
Ning Cheng was able to counter-control the Immortal-Slaying Illusion Killing Formation and use it against the Mou Family members instead, which indicated that his mastery of formations was many times stronger than that of the Mou Family. If the Mou Family didn't find a way to break out of this confining formation, they might very well repeat the fate that befell the Lou Family in the past.
