That crystal is for Mod Sarah's hidden title. It requires a combination of items to retrieve, which no one knows yet. It's one of the 3 titles still left to discover.
- “Never trust a hug | It's just a way of hiding your face.” -
Got to wait for Lord of the Wait title to be discovered first though, as that title is required for Dark Lord. Going to be a long time before it gets discovered it seems.
- “Never trust a hug | It's just a way of hiding your face.” -