C738 Mind Realm Advanced

After spending two hundred thousand years, Ling Tian had finally completed the fourteenth level of the Yin-yang Hundun Spell: the Yin-Yang Seal. This time, he combined his own insights into it. The profound theory that Primordial Chaos Sovereign had taught him, and the Vajra Sutra that Sunlight Bodhisattva had taught him. Under the combination of the three tubes