Testing a pill's effects referred to the pills an Alchemist refined while researching a new Pill Formula.
At this stage, the new pill's medicinal effects were still unknown. Had it reached the ideal state described in the Pill Formula?
All of this required a trial, observing the Trial Taker's reactions, and then adjusting the Pill Formula accordingly.
Only when the pill's effects perfectly matched the ideal outcome would the new Pill Formula be finalized, ready to be passed down through the ages.
Elder Yao had Trial Pharmacists in the past. But as his Alchemy Dao Realm grew more powerful and profound—especially after he became a Great Saint Alchemist—every new pill he refined was shockingly potent and overwhelmingly powerful.
His previous Trial Pharmacists, strong as they were, would nearly explode and die from consuming even a sliver of his new pills, making it impossible to observe any real effects.
