Chapter 408: Chapter 400: 9 is the Supreme Number

As He Song continuously activated the Thick Earth Formulas, his own mana gradually began to be called upon.

Threads of wind started to blow around the room as He Song continued to activate the Thick Earth Formulas.

This was the anomaly caused by the operation of mana and the interaction with the spirit Qi in the surroundings.

However, the spirit Qi whirlpool that appeared around He Song's body was not like that of other cultivators breaking through the Foundation Establishment Realm, formed by absorbing an excessive amount of spirit Qi.

On the contrary, He Song's current cultivation level had already reached Foundation Establishment Great Perfection, and he could only regretfully not draw the external spirit Qi.

Even if he were to activate the Thick Earth Formulas to his utmost, he could not refine the external spirit Qi into his own mana anymore.

Only after exhausting his mana in a confrontation with someone or casting spells could he absorb spirit Qi to replenish his mana.