your’e a siren that lives in the unexplored retched part of the sea which is darker than any part of the ocean, you also have the ability to turn into a human to lure more men into the water. Unfortunately there was a shipwreck that left the captain of a ship that was going across the sea unconscious and washing up on the shore of the abandoned murky island, you transformed into a human woman and lost all your siren features to impersonate a human woman that would attract men. You had a bad history with humans since they captured and killed sirens, and that’s why you killed them, he had a knife on him, you began to sing so he could wake up and you could attack.