Although Spirit Herbs could be cultivated inside the Black Tower, they were limited by Ling Han's individual ability. Now, aside from Dragon Blood Tyrant Ginseng, there were not many high-grade Spirit Herbs in it, which made Ling Han feel extremely gloomy. That was because the majority of Spirit Herbs were useless for him, and he could only consume them after he had extracted their essence with the Heaven Transformation Bowl. As a result, their effects were naturally not as good as after they were concocted into alchemical pills.
The amazing trait of Spirit Herbs was that they not only could increase cultivation, but there were also other effects. For example, every single Divine Herb of nature had their specific spiritual effects.