Gold Core Realm
For the next 10 days, Feng Yun dual cultivated with girls, and after that, he started cultivation in the training room using a million Low-Grade Spirit Stones.
After another twenty days, Feng Yun's cultivation reached the critical point only one step away from Gold Core Realm.
The gap between Foundation Establishment and the Golden Core realm was way too great.
For Breakthrough the gold core realm, one has to turn the spiritual sea inside Dantian into the Solid State and form a gold core.
At this time, Feng Yun's spiritual sea almost turned into the solid-state, one more step he would become a Gold Core Realm Cultivator. Feng Yun would have already reached the Gold Core Realm if it was not for the Heavenly Slayer Sword that was releasing the invisible Qi in the Dantian of Feng Yun slowing the process of forming the core.