Cavern-Sky

"Cavern-Sky" is the most common way that the inhabitants of the Great Cavern of Aman-ya refer to the ceiling of their homelands.
It is covered with growths of Greenbright Crystal and Greenbright Moss that grow in a daily cycle as far as the eye can see and only at the Obsidian Coast far south of Styx does the lambent and life-giving glow end.