The Underworld is hidden deep in the earth and was the kingdom of the damned, ruled by demon Un-Drawog. Un-Drawog sole purpose is to increase the number of souls in his kingdom through either corruption or theft or willing conversion.  The Corrupted are welcomed in the Underworld.

Geographically, the Underworld is considered to have been surrounded by five rivers: Woe, Lamentation, a river of fire, the river of Unbreakable Oaths, and the Forgetfulness. Past the rivers, a diamond gate, and a bridge, guarded by the Seven, formed the entrance to the kingdom. Deep within the kingdom, lay Un-Drawog' vast palace, full with guests.