If these two crystal stones are not used to attack the bottleneck, but are reserved for cultivation slowly, and combined with the spirit stones, Ning Cheng will be sure to reach the late stage of the sea-opening realm, and it is not impossible to even break through the Hua Cauldron. It's a pity that he doesn't have higher-level elixirs or better heavenly materials or earthly treasures, so he can only rely on these two crystals to break through the sea-opening realm....