Pandemonium is one of the Seven Kingdoms of Hell ruled by the Demon Lord Asmodeus. 

In this world, Worshippers of Hell (the Army of the Asmodeus) lurk around and prey on innocent mortals. They are here to torture and punish mortals for their pleasure.  

In contrast, Worshippers of Heaven are sent by God, trying to rescue sinful Mortals from Hell and lead them to salvation.  They are a group of armies dispatched by God, infiltrating Hell through their secret Angel’s Outpost on a rescue mission.

Pandemonium is a battleground between Hell and Heaven, with different alliances, they come to save or condemn mortals. 

Mortals are nothing more than a hell toy, livestock, or the damned in Pandemonium. They are guilty of lustful sin which they brought over from their mortal life. It was their sinful lust that has led them to Pandemonium to be paid off with punishment.