Hollows

Deep central command sanctuary within Phobos moon connected via vertical shafts and hydroponic farm levels.

The Hollows emerge late in the Red Rising Saga as a fortified subterranean stronghold buried deep within the Phobos moon. In Light Bringer it functions as the central command sanctuary for the protagonists' forces, its network of vertical shafts and hydroponic farm levels enabling both rapid troop movement and self-sustaining logistics amid the final war for the solar system. The facility symbolizes the shift from surface-level battles to layered, moon-based strongholds that decide the fate of the Republic.