The D&D cosmology has a unique charm because it mixes moral and religious inspirations with fantasy, gamified elements. Hell, the Abyss (the chaotic evil-aligned plane), and the various Heavens are not just other worlds players can visit if they have the means to travel between planes. They are also the destinations of mortal souls according to their deeds in life. The Nine Hells of Baator are where wretched souls end up if they struck bargains with devils or or were particularly lawful and evil in life. Each layer is ruled by a powerful archdevil, but they all bow to the might and cunning of Asmodeus, Lord of the Nine.
