When Wu Yu was still in the Dong Yue Wu Kingdom, he often dove into the sea to hone his martial cultivation. A large portion of the Dong Yue Wu Kingdom fished for a living. Therefore, he knew that the sea had a large variety of mysterious living creatures. Within the deep seas, there were also countless creatures that were unknown to men. 

When these living creatures became demons, they were of various shapes and sizes with varying abilities. 

Wu Yu did a quick scan across with his Eyes of Fire and Gold. He could see through the true forms of demons, and the true forms left him awestruck. There were really all kinds of demon creatures. Corals could become demons, and so could some wiggling sea cucumbers. There were also countless strange-looking creatures he couldn't name. They didn't look like living creatures and weren't ordinary fish or shrimp. Now they had all become demons. 

After gaining sentience, they swam all around to absorb the essences between heaven and earth. They plundered wherever they went, and their greed strengthened them gradually. 

If Wu Yu had to define the sea region, he would say the region might be even more barbaric than the world of ghostly cultivators. There wasn't any compassion or laws in this place that could restrict one's actions....