LITORAL. Ocean Depth Series, #1

Beneath the ocean, a forgotten civilization is waiting for its last savior. Kael never expected the sea to answer when he called. But when a mysterious artifact awakens a power hidden within his blood, he becomes the target of a relentless organization determined to claim an ancient secret buried beneath the waves. His escape leads him to Aquaris-a magnificent underwater civilization lost to history and hidden from the surface world for thousands of years.
There, Kael discovers that he is connected to forces older than empires, older than memory itself. As war approaches and the foundations of Aquaris begin to crumble, he must decide whether to remain who he has always been... or become what the ocean created him to be. Because some legends are not born. They return.