C682 One Could Imagine

It's so hard to control even in the future, it's still a little hard to control. Not to mention, the other supreme apothecaries relied on their experience to judge the level of the flame. It was imaginable how difficult it would be for them to do so.

It was so huge that this pill had been lost for a thousand years. No one could refine it.

As expected, there was a reason behind it