A Merfolk-Scale Earring

It's a known fact that soon-to-be Pirate King Arthur Pendragon wears a merfolk scale as an earring. It's the only proof he has that he was saved by a merperson in the storm that killed his mother, even as his father blames Neptune for her death. Little does Arthur know, the merman that saved him has just waltzed onto his ship as the new cabin boy, still getting used to his new legs