The First Cultivator - Changing Existence - Chapter 57: Spirit Stone -

... for Zhou Fan to make it back to the cave. Once he did, he went to the center of the cave and began to further observe the metal cube.

Its weight was as much as a mountain and not even the strongest weapons of humanity could injure it. In fact, even Xiaolong wouldn't be able to scratch it despite his second level Qi gathering cultivation and the innate strength of the dragon race.

Once Zhou Fan got a good feel of the cube, he was ready to create his most powerful formation yet. < ...