The primary medicine of the Living Soul Pill requires three kinds of Lingcao, two of which Peter Brown grows in his field. However, the only challenge lies in the plants' age, which is not an issue for Peter. He could simply employ aging methods to cultivate them. Peter also has an easy access to standard Lingcao, which he grows in his field as well. Now, the only Lingcao Peter lacks is the Sacred Herb.
Peter never really expected that there would be Lingcao ingredients in an Elixir formula that he wouldn't be able to gather.
However, after carefully examining the conditions of the Lingcao in the field, Peter came to a realization. The more advanced the cultivator's realm, the rarer the required Lingcao. The majority of Lingcao that he cultivated was suitable for those at or below the Nascent Soul level. If one surpassed the Nascent Soul level, obtaining Lingcao for the use of high-level cultivators would become much harder.
