Casio was somewhat incredulous.
But in fact, it was that simple, because the hardest part was the genuine illusion that had just happened. Apparently carrying a compelling mind-bewildering attribute, even a master of the major accomplishment realm like Casio whose martial will was strong was confused.
The means of killing were similar to the penetrating power of radiation. Secret martial artists lost in the illusion would tremble and die after staying in place for a time. Casio had already seen two elite disciples of the Northern Secret Martial Alliance convulsing on the ground.
Their consciousness was in the illusion, but their bodies were continuously damaged by the real-world radiation, and even their secret martial arts couldn't hold up.