Under the combined attack of four types of demon beasts, Anyuan City was completely reduced to ruins.
Aside from a small number of ordinary mortals who, under the protection of some Body Refinement Practitioners, managed to force their way through the beast horde and escape, the majority of them perished amidst the chaos.
However, the beast horde rampaged in Anyuan City for only three to four days before suddenly retreating en masse.
Only then did the beast invasion formally come to an end.
Although it was merely a small city that experienced utter devastation, such an event was extremely rare after the founding of the Three Realms by humanity. Ultimately, this alarmed the high-level cultivators of Tianyuan City, prompting them to dispatch a large number of people to investigate the exact cause of the city's breach by the beast horde.
Of course, that's a tale for another time.