An underground cavern that has been maintained from the days of the Imperator. It has entrances from every region, though no one knows why this is so. This location has one area. It is missable! To gain access talk to the Fierce Mercenary in the Union of the Golden Chalice Guild in Royotia, or gain access by completing either the The Disappearing Knights quest in Melphina, or The Rainbow Bond quest from Pagus. Interconnects with The Fourth Path through [[The Final Fortress#Fourth <-> Fifth|The Final Fortress]], but is initially blocked in the middle of the latter area.