God or goddess

Growing up we lived on the coast of the divine sea. It was me, my older sister, my parents, and my grandma. every year on me and my sister's birthday grandma would tell the story of the sea god Armines. She'd say how strong he was and how he saved the whole island from monstrous creatures but one day he disappeared. Years went by and he returned but he wasn't the same god our ancestors knew he wasn't strong so the people turned their backs on him and banished him deep under the sea.