When the quality and level of the pill being cultivated was too high, it might develop inner demons during the process and lead to a pill tribulation.
If the situation was handled properly, the quality of the pill might increase another level if the inner demons were removed. But if they couldn’t be removed, the powers of the pill would be swallowed by the illusory demons and the demons would turn real. As they wreaked havoc, the pills would be destroyed.
However, if the pill tribulation was overcome and the inner demons were removed, the quality of the pills could increase. But no one cultivating pills was elated to see a pill tribulation occurring.
The reason was that it was very difficult to remove the inner demons.
