Sector 4 is home to the last remnants of Citeis from the Factory Era, originally being created from the scraps of the original factories from other Sectors. Sector 4 is the only Sector left compromised solely of Factories. The Factories are separated into two layers, the clean and well maintained New Factory layer, and the dark, derelict Old Factory layer.

The citizens of Sector 4 generally have no means to leave the sector, be it to expensive to leave, or work contracts forcing them to stay, it's extremely rare for a citizen of Sector 4 to ever see other Sectors.

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