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Installation 07, also known as Zeta Halo originally known as Gyre 11 by the Forerunners and Oth Koronn by the Banished is one of the seven rings in the Forerunners' Halo Array, located in the Sagittarius Arm of the Milky Way galaxy Unlike the other six remaining Halo installations, which were constructed as a separate array of rings with the diameter of 10,000 kilometers Installation 07 is the only surviving ring from the original main array of twelve 30,000-kilometer-wide Halos However, the installation's diameter was reduced to 10,000 kilometers after most of its superstructure was discarded as a result of heavy damage 117649 Despondent Pyre was assigned as the monitor of Installation 07, and would remain in this position until her destruction during a conflict between the UNSC and Banished that began in late 2559. he submonitor Adjutant Resolution took over as the caretaker of the installation following his superior's destruction It was during this conflict that Installation 07 would once again be heavily damaged, this time purposefully by the smart AI known as Cortana.
In October 2558, the AI Cortana activated the Guardians and formed the Created, intending to impose her tyrannical rule over all civilizations in the galaxy. Cortana later took control of Installation 07 to use it as a central base of operations, largely due to its unique capabilities compared to the other installations in the array Dr. Catherine Halsey decided that there was no other way to end the Created threat other than terminating Cortana, and to accomplish this she crafted the Weapon, a specialized smart AI designed to kill the leader of the Created. The plan was to insert The Weapon into Installation 07's systems, where she would mimic those systems and lie in wait for Cortana, who would be isolated and deleted. Once the mission was accomplished, The Weapon was programmed to delete herself for safe measure. Meanwhile, Warmaster Atriox sought "The Weapon" to defeat the Created following Cortana's annihilation of Doisac and to make Installation 07 the Banished's new home. During his time on Installation 00, Atriox learned that Installation 07 held a secret that could give the Banished a tremendous advantage, and decided that the ring would become the center of his grand plans. UNSC and Banished forces were thus set to collide at Zeta Halo
In October 2558, the AI Cortana activated the Guardians and formed the Created, intending to impose her tyrannical rule over all civilizations in the galaxy. Cortana later took control of Installation 07 to use it as a central base of operations, largely due to its unique capabilities compared to the other installations in the array Dr. Catherine Halsey decided that there was no other way to end the Created threat other than terminating Cortana, and to accomplish this she crafted the Weapon, a specialized smart AI designed to kill the leader of the Created. The plan was to insert The Weapon into Installation 07's systems, where she would mimic those systems and lie in wait for Cortana, who would be isolated and deleted. Once the mission was accomplished, The Weapon was programmed to delete herself for safe measure. Meanwhile, Warmaster Atriox sought "The Weapon" to defeat the Created following Cortana's annihilation of Doisac and to make Installation 07 the Banished's new home. During his time on Installation 00, Atriox learned that Installation 07 held a secret that could give the Banished a tremendous advantage, and decided that the ring would become the center of his grand plans. UNSC and Banished forces were thus set to collide at Zeta Halo The Banished arrived first, and had time to lay claim to the ring, landing a preliminary invasion force and establishing anti-air batteries. When the UNSC Infinity arrived, it was immediately ambushed by the Banished fleet and boarded. The UNSC still managed to deploy the Weapon as planned, and Cortana was successfully trapped, but the Banished had caught the UNSC completely off-guard. The tide quickly turned against the UNSC, and as the Infinity began to buckle under the ceaseless barrage from the attackers, Captain Thomas Lasky reluctantly gave the order to abandon ship. The Infinity is presumed destroyed and multiple frigates were destroyed by the Banished, while the various human air wings, landing parties, and evacuees all suffered heavy casualties during the descent to the ring due to the heavy AA fire and were scattered, concluding the battle in a victory for the Banished and a demoralizing defeat for the UNSC. Both the Master Chief and Atriox were believed to have perished during the battle, the former while fighting aboard the crippled Infinity, and the latter when Cortana deliberately destroyed part of Installation 07 to prevent Atriox from controlling it.
