On the battlefield of the Deity, no one was absolutely safe.
"...but beyond Rule-level, it's really hard to die completely, the stronger they are, the harder they are to kill...."
Undying-nature seemed to have become the standard for the strongmen beyond Rule-level.
There were many reasons, but their strength was not the most important; the fundamental reason was that they had often abandoned their pure flesh bodies... Completely "Polluted" and "Regulated," they became massive amalgamations of contamination mixed with "World Rules" into an Extraordinary Pollution.
Pollution could be covered up or expelled, but it could not be eradicated.... This was the source of their undying nature, no vital weaknesses, not even so-called important biological organs, they could hardly be considered "alive."
They were, in fact, a "Quantum," a "Container" holding countless contaminations, and their advancement was essentially about expanding the "Container's" limit.
