There were cold cores in his head, chest, and dantian. He had to break the balance between the three so the cold core at the head would sink and fuse with the one in the chest. If that succeeded, then that was the initial fusion.
The next step would be for that fused cold core to sink and fuse with the one in the dantian. The moment the three cold cores fuse, there is a chance for a real core to form.
Wang Lin quietly sat inside this small, stone room filled with Yin energy. His eyes were cold, his divine sense was in his body, and his focus was on the cold core in his head.
The first step for him was to make this cold core sink.
Wang Lin knew that it would be difficult to fuse the three cores before, but after experiencing it, he felt like difficult was an understatement. It was more like unimaginably difficult to fuse the three cold cores.