The conditions required to cultivate Ghostly Image Substitution were extremely harsh. The first one was to possess the bloodline, the second to be innately perceptive regarding spatial attribute, and third was formidable comprehension. Only if the person had all three things would they be able to grasp the essence of this skill.
Otherwise, even cultivation relaying globes would be of no use. Those whose perception regarding spatial attribute was weak, they could never learn this skill. This was the demanding nature of a supreme skill. The life wasn't so easy that anyone who wanted to cultivate could cultivate, and because of that, now everyone who was in possession of this supreme evasion technique could cultivate it for their own life-saving purposes.
