The rewards of a higher grade were indeed much more powerful. Song Shi condensed three Golden Cores in one go, and his realm had also advanced from the middle stage to the late stage. Every Golden Core he had now was larger, and his Law Power was purer.
Song Shi exhaled. "I've finally condensed the true nine suns. The next step is to combine the nine suns and cultivate an Essence Body."
The Nine Yang Divine Technique was a martial arts technique. It has no effect in condensing of the Nascent Soul. Instead, it fused Law Power into the body and condensed the Essence Body.
This Essence Body was actually the same as the Nascent Soul. The difference was that one was condensed on the inside, whereas the Essence Body was cultivated with the current physical body as the foundation.