The throne-hall of Orcus on the plane of Thanatos, in the city Naratyr
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Also known as The Pits of Orcus, this is as near to a thronehall as the Prince of the Undead has ever got. As one passes under one of the crumbling carven arches that form the entrances to the structure, it opens out around in all its' terrible majesty.
A circular pit half a mile across, stepping downwards in concentric circles of stone. Each tier is occupied by thousands of petitioners; soul shells, the forms in which the unfortunates whose ultimate destination is the Abyss spend eternity. Pitiful, tormented, hopeless, the souls of the damned are fastened to the layers of the Well to suffer.
And suffer they do; screaming and moaning, pleading and weeping, the souls of the dead create an indescribable volume of such sound as to rend the heart.
At the focus of this cone of despair is Orcus' throne, a heap of skulls ten feet high mounded into a seat.
It is quite apparent that the Well is a massive necromantic power focus. The usage of the tortured suffering of so many souls for one's own ends, especially in support of the goals of demons, was an act of quite definite evil. The power available was immense, but the taint of it's use would never leave one's soul.