The mutation of the guard attracted great attention because, for cultivators able to participate in the expedition, minor illnesses were negligible, but such inexplicable severe mutations must be taken seriously.
Minor ailments might result from some cultivators' physical characteristics leading to incompatibility with the environment, but for something as severe as metallic growth in the arm, the environment must be the cause.
Everyone in the expedition is in the same environment. Today, it was discovered that he has metal in his arm—crucially, he himself is completely unaware of it. So could there be problems with others?
The expedition quickly organized a comprehensive health check, which formally ushered in a wave of panic.
It turned out that unbeknownst to them, the mutation had already spread to everyone, just to varying degrees and with different symptoms.
