This is the massive Progenitor vessel that broke up near the Karos Graveyard, and whose ruins are littered all through the sector. In this wreckage, the Keeper automatons are still active, attempting to repair and defend this long-dead relic.

The massive, ancient mothership has broken into numerous large sections: the Dreadnought Berth section (aft), the Foundry section (center), and the bow Bridge section (also referred to as the "Lighthouse", which housed the Oracle). The forward section has split into numerous smaller pieces.