Deep Dark Ancient City

An ancient city is a generated structure found in the Deep Dark, harboring loot chests containing items that cannot be found anywhere else. It is made up of long corridors with wool floors (to prevent vibrations), as well as some smaller ruins off to the side of the main corridors, which contain 1-2 loot chests. The city center features a large rectangular structure resembling a warden's head, which contains reinforced deepslate, which is unobtainable in Survival mode.

In When the Cold Breeze Blows Aways, it would be happened when the Coalition of the Red Star have discovered it

Soon, it will be the main base of Exegol as the last stand of the Coalition.