Description: Underground city ruins where magma flows. In the past, the subway tracks were used as a refugee intake route leading to the Den. The keloid-like Aragami wreckage covering the walls is thought to be evidence that giant Aragami once burrowed deep underground and tried to devour magma, only to burst when they were unable to withstand such tremendous energy. Details are unclear. The sight of magma continuing to flow in the pitch-black darkness is like a scene from hell.