Core room antechamber

The core room antechamber was a massive chamber located at the center and core of the Forerunner-constructed world Onyx. The antechamber served as the only entrance to Shield World 006, sheltered in a slipspace rift within Onyx's core. Upon the powering up of the Halos, the antechamber was reachable by and via specific Slipstream translocation devices; however, the core room is only accessible for a short time and duration after the Halos are primed.

The actual portal to the shield world was itself in the center of a large stepped structure within the antechamber, which SCPO Mendez compared to Hell in Dante's Inferno, although Dr. Catherine Halsey noted that Hell in Inferno was a pit of descending rings. Following the priming of the Halos, the structure would gradually 'flatten' until it became level with the ground. At this point, the entrance to the shield world would be sealed.

The antechamber was the site of a desperate rearguard and strategic action by Spartan-IIs and Spartan-IIIs led by Lieutenant Commander Kurt Ambrose against Covenant forces under Fleet Master Voro Nar 'Mantakree during the Battle of Onyx in 2552. The antechamber was destroyed when Kurt Ambrose detonated FENRIS nuclear warheads within, sacrificing himself to deny the Covenant access to shield world.

List of appearances

 * Halo: Ghosts of Onyx