Scion: Taking It to the Titans
Before the shattering of the Titans’ prison, Duat was meant as a place where the dead might be tested and purified. Those whose hearts were found to be heavier than the feather of Ma’at were pushed through a gauntlet of horrible tests and rewarded for completing them by being permitted ever closer to Sekhet Hetepet, the paradise city of Osiris. Many souls did not survive these tests and were dispersed into oblivion.
Others simply chose to remain at one of the Twelve Gates, the places of reward for accomplishment along the way. It had been many long years since any new souls had entered Duat.
Duat is surrounded on all sides by mountains, which ascend upward eternally. The whole of Duat is roughly circular, and its northern and southern reaches are purest desolation. Black sands that consume flesh stretch into the distance, and wailing winds are all that remains of the thousands of unfortunate shades that have wandered to these bleak expanses over the centuries. The eastern and western mountains are the tallest, and they both bear a massive cavern at their bases. A mighty river, deep and black, flows from the western mountain, which is called the Gate of Stars. This river stretches the expanse of Duat, meandering somewhat, but always traveling eastward until it descends with the roar of falling water into the cavern of the eastern mountain, which is called the Gate of Clay.