The process of taming an Earth Flame was a difficult and complicated one, involving a heavy dose of risk, especially in case when the level of the flame was higher than the alchemist's.
But with Wu Long's instructions and direct help, it did not pose any hardship or risk at all, as Yu Huan smoothly took control of the Earth Flame and then absorbed it.
Her cultivation rose from the 3rd level of Foundation Building Realm that she has painstakingly climbed to with the techniques and knowledge he gave her, to the 1st level of Core Formation Realm just from absorbing the flame.
And as he anticipated it, he naturally gave her instructions on advancing through both realms beforehand.
This whole process took 2 days, and they also spent one more day with Luo Mingyu, discussing the refinement of the Pills and Demonic Beast blood.