The Drowned Captain is a godless enemy whom your hero(ine) may enter into a duel with. Winning against him does not affect your Wins/Losses, but may get you Davy Jones' Locker, among other things. Opening it requires 50% godpower and may effect your hero(ine) in a good or bad way.
05:24 The Drowned Captain was used up for gold and experience! Time to return to my heroic deeds.
05:24 Suddenly felt like I had to make use of the Davy Jones’ Locker. Shook it as hard as I could and out came a new, shiny golden brick!