[Masteria] The Corrupted Grandmaster
Start it with Jack Barricade in Cavern of Fear. Complete it with John Barricade in Lobby.
Requirements
Lv. 190+
Quests
NPCs
Locations
Jack Barricade Start
John Barricade Complete
Connected quests
Dialogue
Turning in the quest
Additional replies
Those symbols are the biggest clue we've got. With John's expertise in ancient languages, he's just the playmaker we need right now.