A place of great power and mystery, the Pandemonium Fortress is Heaven’s ancient staging ground for incursions into Hell. Standing as the last bastion of the Light before the Gates of the Burning Hells, this place has been hallowed by the blood of thousands of champions, mortal and Angel alike. Comprised of a small antechamber, a sanctified waypoint and a plateau where trades can be made, it is miraculous that the structure could stand against the corrupting powers of Hell.
While it seems strange that Halbu and Jamella - often called the Merchants of Light - would engage in matters as trivial as the buying and selling of armor and weapons, it makes a certain sense in the scope of how the agents of Heaven are allowed to interact with those of the mortal realm. Like Tyreal, they are forbidden to aid brave adventurers directly, but their buying and selling of items is indirect help at best, allowing them to follow the letter of their Holy Law.