Ordinary disciples of the Mystics Yin Sect used only a set of nine, eighteen, or twenty-seven rods to arrange their arrays, and it was rare to see thirty-six.
Because it was difficult for a single person to control that many "Evil Spirits," although they were not as subtly influential as Divine Demons, they brought a powerful recoil when used, continuously impacting the user's Primordial Spirit Soul. Once they could not be suppressed, they would "rebel" and devour their master, even more ferociously than Divine Demons.
The original Evil Corpse Gu Chen used eighty-one rods, which already constituted the complete Mystics Yin Soul Refining Formation, and once activated, it shook heaven and earth.
