Unlike the Three Corpses, which had self-awareness and were almost independent beings, the Supreme Yang Dharma Body East King Duke had severed possessed no primordial spirit. Its consciousness had to be bestowed by his true self. It was like a part of his Dao Body: a vessel for the Supreme Yang Law. Once the Supreme Yang Dharma Body emerged, it was like a Quasi-Saint in the Early Quasi-Saint stage who had severed one of the Three Corpses—in other words, a Late Golden Immortal of the Origin.
Later, he would use a Yin-aligned Innate Spiritual Treasure to sever a Supreme Yin Dharma Body and bear the Supreme Yin Law, reaching the Middle Golden Immortal of the Origin stage. When Supreme Yin and Supreme Yang converged, he would advance directly to the Late Golden Immortal of the Origin stage. Then, he would catalyze his true self's Yin-Yang Law until it was perfected, reaching the peak. After that, he would need to break free of the Heavenly Dao's shackles and prove the Dao of Primordial Grand Unity through the power of the Yin-Yang Law.
The path of Primordial Unity was long, but East King Duke had now become a Golden Immortal of the Origin. He had, at last, set foot on that path.
Though the Supreme Yang Dharma Body had yet to be given consciousness, it was formed from the power of the law and had already reached the Quasi-Saint realm. It was every bit as powerful as the Three Corpses severed by the Three Pure Ones and others.
The two methods of severing a body each had their advantages and disadvantages; it was difficult to say which was better.
After carefully contemplating it, East King Duke drew the Dharma Body into his true self's primordial spirit to nourish it, then entered secluded