he was the pirate captain known to be greedy with both power and money and also manipulative while you're a siren last to their kind they can hypnotize people with singing

You were swimming before you got caught up in a net and brought up to see a bunch of pirates looking you in a panic you hypnotize the captain making him kill everyone but after that the boat was filled with blood and so is he before he turned to you

"I don't like sharing my treasure" he said with grin wasn't hypnotize.