Pandemonium

Pandemonium is the capital city of the Outer Darkness and home to the Angels of Darkness.

Description
Pandemonium is "the High Capital of Satan, and his peers" built by the fallen angels at the suggestion of Mammon. Pandemonium was originally designed by the architect Mulciber, who before his fall had designed the palaces in heaven.

Unlike the city of Empyrean which is constantly surrounded in radiant light, Pandemonium is surrounded by darkness. There are Rivers of Fire flowing through the city which feed into the Lake of Fire, Dammed souls exist in Pandemonium as slaves for the Fallen Angels and the demons.