The fact that the Undead Domain can suppress Zhou Tian and their domain isn't terrifying. Nor is it insurmountable that the undead within the domain can resurrect endlessly. The worst aspect of the Undead Domain is that within it, without special methods, outsiders like Zhou Tian cannot recover from their injuries. This situation alone is a real crisis that could cause these king-level monsters like Zhou Tian to fall.
The strength of the Hellfire is extraordinarily formidable. Even though they're at the same level, if Zhou Tian had to face the Hellfire, he knew that even ten of him combined might not be able to contend against it.
However, even the mighty Hellfire, after slaying numerous saint-level undead, succumbed due to the inability to heal its injuries. In the end, the saint-level undead consumed it alive using this method. Therefore, based on the abilities of the Undead Domain, anyone who gets trapped in it without an absolute strength advantage, is likely to face danger.
