Leon remembered that the Long Rainbow Escape is a spell from the god and demon novel "Investiture of the Gods".
The Long Rainbow Escape allows the practitioner to transform into a rainbow light and teleport out of thin air, unrestricted and incredibly fast, able to easily escape even from powerful magical treasures like the Mixed Element Golden Dipper and the so-called "all-encompassing" Five-Colored Divine Light. It is the unique spell of Daoist Ludia.
As for Daoist Ludia's background, the original story describes him as a mysterious loose immortal of unknown origin, referred to by the author as a treasure within fire, the essence of departure from the earth, and the spirit of samadhi. In many later prehistoric novels, he appears as the prince of the demon tribe, with his true form being a Three-legged Golden Crow.