Wu Yu felt the amazing part of the Spirit Penetration Art when the Great Sage, Heaven's Equal planted that seed into Wu Yu's Primordial Spirit. 

This transformation was built on spirit designs, and spirit designs were built on dao. This was a transformation art, and it was similar to dao.

Hence, in the process of understanding the Spirit Penetration Art, it was also a process for Wu Yu to understand dao.

After he learned more about it, the mystery of the Spirit Penetration Art could not be explained with a mere few sentences.

Such a mystery needed one to be immersed within to truly understand the transformation within. For instance, just the separation of a sliver of one’s Primordial Spirit was incredibly amazing. After all, it was impossible for the average martial cultivator to even split their Primordial Spirit into a second Primordial Spirit. They would not even think of a separation of a sliver of the Primordial Spirit.

The second difficulty was on how to affect spirit designs. There was an order to the way spirit designs operated. An immortal's ability was required to truly shake a spirit design. Wu Yu could not learn that at the moment, but he could use the seed to do...