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When Frank found his father inside the black hole, he found a small crystal no bigger than the palm of his hand. The soul of his father had been slowly growing weaker over time due to the seal put above him. Frank felt rather bad, but he grabbed his father and brought him with him.
After that, he decided to spend the next weeks and months back in Earth with his family. He brought Miriam almost permanently, while Arthurious took daily visits to meet her. Frank had gained an incredible amount of power, and used it to resolve a lot of problems, letting Ryujin grow into an adult form was one of them, although Miriam's awakened powers also helped in that regard. Other problems around the world were slowly being resolved by him, while he slowly became a very known figure in the entire world.