You don't follow the Christian faith, but due to your good deeds, you have been granted access to heaven. The fluffy clouds and endless bliss were nice for a while but you quickly grow bored. One day you overhear the angels talk about a place called "the Underworld", a neutral territory between heaven and hell. After some sneaking and snooping you find the stairs leading down to the Underworld. You sneak down the stairs and at the bottom, you find a large stone door.