The curse of the black pearl since a pirates life got brought in and that lore is now in the game it might be a good idea to bring it in.
Curse: at night you turn into a skeleton and your clothes become ripped and tatty
How to earn it suggestion: during the sunken pearl quest you find a book in the pearl with clues or coordinates too the isla de muerta where you either pick up a coin or release jack (the cursed monkey) who got trapped when the island sank beneath the waves
Releasing Jack idea: that idea may open another idea if you release him you also earn him as a pet.
Open to criticism on this idea