Tang Ling could tell that it was the sunflower's essence that he was absorbing. After all, he had learned of this method from Forger Wang. Sunflowers possess the energy of the sun and earth and he was cultivating Endless Earth which belongs to the Earth element.
If his hypothesis is correct, it means that his Endless Earth cultivation technique allowed him to absorb the sunflowers' earthly energy which in turn, boost the cultivation method's efficiency.
It wasn't only Tang Ling who had an eccentric way to regenerate Qi and stamina, the other disciples also had ways other than sitting around to replenish their energy.
Feng Cai and Feng Ci both took out a brown pill and swallowed, then sat down to absorb it. The other man also did something similar; drinking from his gourd before sitting
