Fugue Plane

The Fugue Plane is where the souls of mortals are drawn when they die. The vast majority of this plane is flat, gray, bland and nondescript, with no notable topographical features. The plane's only significant feature is the City of Judgment in the middle of which stands the Crystal Spire where Kelemvor & Jergal reside.

There are only 3 methods of getting to the Fugue Plane: As a divine servant collecting a deity's future petitioners; through portals from the Nine Hells or Abyss or dying.

Petitioners
The petitioners of the City are the servants of Kelemvor & Jergal, The False & The Faithless.

Kelemvor & Jergals servants enact punishments on the False & act as a city militia to protect against Tanar'ri raids and, on rare occasions attack the Abyss to punish demons for attacking the city.

The False are souls that committed dread crimes during their lifetimes. They have been judged by Kelemvor and are punished for all eternity when found guilty. Depending on the severity of the crime the punishment varies: from escorting visitors to the city to unspeakable tortures that would make the most malicious demon cringe.

The Faithless are those mortals who don't have a divine patron to speak for them. Either because they never worshiped one, it died or simply that their god doesn't want them for some reason. Their fate is to be made part of the City wall. Each soul is held together with a green mould that noone who is part of the wall can break free of. After a time the souls dissolve to become a natural part of the plane itself.

Kelemvor's Agreement
Souls can reside in the city for up to a tenday before a divine servant comes to collect them, often completely clueless to the fact that they are dead. During that time, Baatezu are allowed to inform souls of their state and bargain with them. Souls are offered the chance to become devils themselves, usually starting as a Lemure but having the chance to advance through the devillish ranks possibly even becoming a Pit Fiend eventually. This is the main way Baatezu propogate. The prospect of becoming a devil may seem abhorrent to good-aligned mortals but those who follow evil & chaotic deities and those who fear what awaits them in the afterlife are much more likely to take up the offer.