The Lightkeeper

The Light Keeper appears in the episode 5 season 2  "Emily". It is  an  incarnation of Capitain Flint's Curse   and looks like a is an undead creature in a purple cloak with a lantern.It uses lantern's light to lure ships. Capitains of ships are  mistaken that this is  a light of a  lighthouse and follows it, then their ships are broken on rocks.

The Light Keeper  steals  the souls of people who came to his  shipwreck graveyard. It transforms to the people you love and care for, luring you just close enough for its eyes to open to reveal itself before transforming, taking the soul or ghost! The Lightkeper also can hypnotize their victims.