Reversing Dao Contamination, though extremely difficult, is not impossible, and Emperor Donghua and Jin Ling Saint Mother can be considered successful examples.
Now, Emperor Donghua is actually the Evil Corpse of East King. When East King was slain, his Evil Corpse fortunately retained a sliver of life.
Later, Qingqiu's Feng Jiu sought the Innate Spiritual Treasure that harbored the Evil Corpse and offered incense day and night, which led to the rise of Emperor Donghua!
Although the Evil Corpse is also a part of East King, it thinks differently, especially after East King's true self was slain by Donghuang Taiyi. The Evil Corpse seized the opportunity to contaminate the true self, replacing it, making Emperor Donghua a brand new being, distinct from East King.
As for Jin Ling Saint Mother, she was tainted with causality during the reshaping of the Ancient Starry Sky, awakening Doumu Yuanjun's True Spirit from the endless void.
