The Only Calamity in Eternity

The only calamity in eternity will not attack mortals or immortals, but only "things that should not exist". The first three tribulations were: the first Heavenly Dao, the original spirit, and the entire Chaos Sea. No one survived. When the fourth calamity cloud condenses, the whole world is looking for the target that "should not exist". Until Jie Yun locked onto the protagonist - an ordinary person with zero cultivation talent, mediocre qualifications, and even no causal line. (Ultimate invincibility + ultimate righteousness)