You will Watch Winx Club Season 6 Episode 15 online for free episodes with HQ / high quality. Stream cartoons Winx Club 615 Mystery of Calavera. In order to lock the Legendarium, the Winx must use their new Mythix wands to find the fantasy emerald. The Winx, Specialists and Paladins travel to Calavera to find the emerald that’s hidden on a sunken pirate ship. Eldora informs the group that the emerald does not exist in the real world. Instead, they must go into the Legendarium to seek it. Selina sends the Trix into the Legendarium to destroy the Winx.