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City of the Damned

From Diablo Wiki

As one treks into this City, it becomes darker and more sinister than the two areas before it. The more evil one was in life, the deeper into Hell they will go.

In the center island-cliff of this City is a sinister Cathedral; apparently a city hall or some other vestibule of leadership. The stained-glass windows are named "An Evil Force." They are destructible, but do not appear to be anything else. However, Deckard Cain has more to share on this:

[edit] Lore

"Just as the Lord of all Terror brings life to nightmares, so too can he imbue inanimate objects with his vile presence. Culled from the desecrated churches, Stained Glass Windows can sometimes be found on the Mesas in Hell. These panes of colored glass are not what they appear, however -- they are actually alive! Don't worry, adventurer, they lack both mobility and knowledge of the arcane arts and so, they cannot attack you. Perhaps, they too are used to alert the demons of the underworld of unwanted visitors... The agents of evil are everywhere in these dark days and, whether you have been aware of it or not, you are being watched!" - Deckard Cain
Act IV Zones
Pandemonium FortressOuter SteppesPlains of DespairCity of the DamnedRiver of FlameChaos Sanctuary