Roan went back to the Alchemist Hall and bought all the herbs he could. Although it cost a few thousand Rank Two Spirit Stones, neither Rean nor Roan bothered with it. At the moment, Spirit Stones were not as crucial as raising their cultivation as fast as possible.
Although Roan was missing four materials for concoction, the fact was that the rest was available for sale in the sect. He would need to find the right combination for Dark and Light Cultivation Stabilizing Pills, so he decided to start with the ones he has at the moment.
However, Roan seemed to have underestimated Old Worm experience. He spent three entires weeks in the old hut, failing his concoctions one time after another. However, he came to understand why Old Worm added those four rare items on the list in the end.