<p>At that time, there was a sea - dwelling monster named "Yan Gong" near the sea. It often used porpoises in the water to summon wind and incited water demons to raise huge waves, capsizing boats and causing great disasters to water travel. Mazu traveled to the East Sea. The vast expanse of blue waves stretched as far as the eye could see, with the water and sky merging into a boundless expanse. Soon, surging waves rose in the middle of the river. The boatman shouted in a hurry, "The mast and rudder are shaking violently!" Mazu ordered to drop the anchor. Then, a monster was seen with its beard sticking out and eyes bulging, wearing a golden crown and embroidered sleeves. It rose and fell with the tide, touching the mooring ropes and brushing against the masts. Its coming was like a flash of lightning and a rumble of thunder. Mazu remained calm and revealed her divine power. Suddenly, a whirlwind churned the waves, and the river water surged backwards. The monster was awed by Mazu's divine power, kowtowed to apologize, and then swayed the boat away. However, it was only subdued by the magic power for a while and was still unconvinced in its heart. Then, it pretended to use its transformation skills and turned into a divine dragon, winding and galloping, surrounded by clouds and mist. Mazu said, "If this monster is not eliminated, the storms will never stop!" So she dropped the anchor in the middle of the river again. The divine dragon rolled left and right, running out of tricks. Eventually, it changed back to its original form. It was seen neatly dressed, looking like a man, and was fixed in place by the anchor and unable to move. Mazu ordered someone to throw down a rope. The monster was attracted as it approached. Unconsciously, it stuck firmly to the rope as soon as it touched it and could not break free, only floating on the water. Only then did it become afraid and admit its guilt. Mazu admonished it, "The East Sea is dangerous. Now you are in charge of the celestial group in the underwater palace. You should protect the people from danger." From then on, Yan Gong always obeyed the restraint of this magic power and became the general manager under Mazu.</p>