At every historic Pill Refiner's Assembly, the most exciting part is certainly the last segment called Alchemy Tao Challenge.
The so-called Alchemy Tao Challenge involves the genius pill refiners of three countries co-selecting three challengers. The rest of the contestants can choose to challenge one of them. The successful challenger becomes the new host and continues receiving challenges.
If one sustains five rounds undefeated, they can become the real host and no longer need to accept further challenges.
The last three hosts standing will face off in a final showdown. The victor becomes the strongest host and is guaranteed a place in the Pill Pole Tower.
From a rules perspective, the Alchemy Tao Challenge is quite fair. Everyone has a chance, and it's not guaranteed you'll remain in the host position.
At this moment, the genius pill refiners from the three countries had already selected their three hosts.