The Underworld, known as Inferis, is a vast expanse of demons and other creatures. Most are evil, while some are there to help keep the others in line.
There are many regions and kingdoms in Inferis, but the most widely known region is the one everyone expects to see when they hear about the underworld.
Some areas of Inferis are unbearable to inhabit, and are used as prisons for souls who have committed heinous sins.