At present, he only had two Spirit Concentration Pills with him. Even if he used them all, he could not possibly reach the next spiritual source. Wu Yu decided to hold on to them for now. 

After Su Yanli left, he started to consider his own path of dao cultivation.

"I'm still three spiritual sources away from establishing my immortal roots. But I have to start making preparations to search for the immortal roots now."

Su Yanli had left him a book called Immortal Roots Compendium, which introduced many common immortal roots. Wu Yu was prepared to spend some time to absorb the information. If he chanced upon an immortal root in the future, the chances of acquiring it would be greater. 

"The Invincible Vajra Body's first tier only helps me achieve my first two spiritual sources at a fast pace. Next, I have to consolidate and stabilize my condensed qi in order to stabilize my spiritual source. Haste makes waste. Besides, I'm broke now, I don't have many Spirit Concentration Pills."

At least, Feng Xueya would not give him any Spirit Concentration Pills.

Firstly, that was only fair. Secondly, it would train Wu Yu's own resourcefulness.

"However, if I want to have the immortality arts that synergizes...