The Dragon Gate
The Dragon Gate is a fabled location at the top of the Shi no Yosai fortress of the Kamejin on the Kyoukai Shima border island, said to be the only prison in the world that can hold a Dragon. A giant gate made of an unmeltable metal, likely Fuccium, houses the five Dragons that lie within.
The CageMost of the Dragon Gate structure is made of the same unidentifiable black stone that the Shi no Yosai itself is made of, a stone that some say is a form of obsidian. While this would explain its near indestructable strength, some debate the possibility of obsidian being used in the construction. However, no better suggestions have been brought up. At the front of this obsidian cage is a gate, made of an unmeltable metal. This gate is constructed with jagged metal, seemingly rusted over, yet still as sturdy as ever. It appears like the teeth of a dragon, making the cage itself the very maw that has swallowed up those Draconic figures it holds captive. The Dragon's Gate locks these dangerous creatures away from the world. It has been said of the Gate's design:
"The only way to capture a Dragon is with another Dragon, and since man could not tame the Draconic forces... they built one to compensate."