In the centre of the Acatus Spire in Hive Sibellus, Scintilla, lies the Postumus Halls. As Sibellus in general this area is a broad composition of industry, factories, religious structures, commercial buildings, residential areas etc. - all put together in an architectural nightmare. The Halls spreads wide and deep and divided by a wide gorge the runs through the entire area. At some places the gorge reach almost down to the Underhive two miles below. The exact number of occupants in this place is unknown but estimated to around 3.000.000.