Half a month later.
In the night.
Yibai hid inside a mountain cave.
With a monster's tail, he memorized the technique of 'Alchemy of Stones' that he had recorded.
For him to master this technique was also very difficult.
The difficulty was far greater than that of the 'Rain Prayer'.
The first part of the Taoist Spell explained to him what Taoist Alchemy is.
Taoist magic involves swallowing an inner core and applying alchemy externally.
Besides the inner core, there is also External Alchemy in the Taoist Sect.
To put it simply, External Alchemy, also known as 'alchemizing pills', gathers the essence to form a pill, which is ingested to enhance cultivation.
There are many particulars to the alchemy of External Alchemy: according to the book, one needs to be in a rarely trodden place of remarkable natural beauty to refine it, otherwise 'with evil qi entering, the pill will not form.'