Time flew by; another half a month had passed in the outside world, and the people in the Dark Yin Celestial Tower had cultivated for another five hundred months, or over forty years. Wu Qi had crazily devoured the energy in the outside world each day during this period, converting it into chaotic energy. It was then refined and purified into energy essence—the root of any immortal—with his own fleshly body, and channeled to all his close ones and subjects.