Mortal Cultivation: Return of Heaven and Earth

In the land of Kyushu, all spirits coexist. All mortals have spiritual roots, but they are as weak as a candle in the wind and can only maintain life. Because of their strong spiritual roots, immortal cultivators can absorb the origin of heaven and earth and embark on the road to immortality. However, I don't know when it started. Immortal cultivators stopped looking up at the sky and turned to look down at mortals—— Use mortals as cauldrons to extract the source of spiritual energy and refine yourself. And I am the last monk of heaven and earth in this Nine Nether Purgatory.