A four-armed demon is equivalent to a cultivator at the Heavenly Immortal realm, and the four-armed variant is specifically specialized in physical strength among the demon race.
However, a single four-armed demon could never breach a defensive grand formation. The reason for the "thousand-mile dyke collapsing due to an ant nest" effect was that every point and surface of the entire formation was under ferocious assault. Powerful demons at the Golden Immortal realm were suppressing the formation with their arts, leaving the defenses vulnerable and making certain nodes easier to compromise.
The moment the four-armed demon before them tore a gap in the formation, Gong Zijia calmly issued an order: "All sect disciples, retreat immediately! My sect and the disciples of the Fanyu Academy will cover the rear!"
Chapter 4762