Underworld

the Underworld is a labyrinth-like system of tunnels located below the surface of Tellos. in the Underworld one can find enormous halls and roadways carved out of the stone by some ancient subterranean civilization.

the Underworld is not a dead place though. there are many insects, and edible mushrooms grow in there. underground waterways are common. terrible non-Shade creatures may live in there too.

during the Fourth Night, the Shade nightcasters formed their nest at the entrance of a great cavern in the Underworld. a force of a hundred-thousand-strong, composed of Archknights, Lightbringers and regular humans assaulted the Underworld. once in the Shade's nest, the forces killed the nightcasters and brought forth the Fifth Day. they spent a year trying to find their way back. of the original hundred-thousand, only a mere hundred survived to see the surface again. among the survivors