"Learning the Nascent Yin Yang Single Sword Strike requires one to possess two different kinds of spiritual power. One that is firm and unyielding and one that is soft and accommodating. One yin and one yang!" 

This was what was engraved upon the dao technique.

Just that dual spiritual power requirement made it difficult for anyone to cultivate it. It depended upon one's Qi Condensation Spiritual Art.

Most of the Qi Condensation Spiritual Arts that allowed one to produce two types of spiritual power had already been lost to the annals of history.

However, Wu Yu's Great Way of Immortality Art could bridge this gap.

The Great Way of Immortality Art was developed upon the basis of yin and yang being mutually supportive, and it created two different kinds of spiritual power.

When it came to the tempering of the fleshly body, Wu Yu possessed the Invincible Vajra Body and was at the Inner Vajra Buddha tier. This brought along with it a tyrannical strength and was at the peak of body refining.

In terms of spiritual power, he possessed an art that harnessed the harmony of yin and yang, allowing him to better understand the great dao. 

As he possessed the necessary foundations to learn this dao technique, Wu Yu was determined to learn it. Even though...