To give another similar example, there was the Battle of Jialing Pass during the War of the Two Gods back then—even an artifact like the Sea God's Trident only managed to poke a tiny hole in the city walls of Jialing Pass.
As the pinnacle of human-made architecture, Tiandou City might not look pretty, and it was certainly clumsy and outdated, but relying on sheer brute force and overwhelming firepower, its defensive capabilities were still exaggeratedly powerful.
The city walls were a hundred meters high and a hundred meters thick. Average Hundred-Thousand-Year Soul Beasts looked like tiny dots when charging up to the front of the walls. Aside from primeval giants standing over a hundred meters tall like the Demonic Whale King, Di Tian, and the Snow Demon King, other Beasts didn't even exceed the height of the walls.
Chapter 874