dec 11, 2552 - Battle of Installation 00
Description:
The Prophet of Truth, having successfully activated the artifact in Kenya, left Earth through a Slipspace portal to the Ark, a Forerunner structure that could be used to fire all of the Halo installations at once.
After returning to the Sangheili carrier Shadow of Intent with a construct believed to be Cortana, John-117 discovers that it is not Cortana after all, but a looped message from her. It contains vital information nonetheless: the message states that the Gravemind has firmly entrenched itself and the Flood on High Charity but that there is also a way to destroy it without lighting the Halo rings.
Despite Lord Hood's urging, Commander Miranda Keyes, along with John-117, Arbiter Thel 'Vadam, Shipmaster Rtas 'Vadum, and 343 Guilty Spark, joined the Separatist Fleet of Retribution through the Slipspace portal to the Ark.
The Separatists on arrival immediately engaged the Loyalist fleet stationed to protect the Prophet while UNSC Forward Unto Dawn deployed Marine Shock Troopers to locate Truth. Despite being outnumbered 3-to-1 in space, the Separatist fleet made short work of the Loyalist space forces, likely due to the Sangheili superior tactical skills. The Covenant Loyalist Fleet had been destroyed and the only Loyalists left alive were Truth and his forces on the Ark. 343 Guilty Spark, now working with the UNSC-Separatist Alliance, led John-117 and the Arbiter to the Ark's Cartographer where they pinpointed the Prophet's location. By then Truth had already holed himself in a secure facility near the core of the Ark and had activated a large barrier around the entire core to ward off the attacking forces.
The UNSC ground forces, along with Separatist reinforcements, assaulted three emitter pylons that powered a small section of the barrier. When the defending forces were eliminated and the pylons shut down, Shadow of Intent began its attack on Truth. At the same time the former Covenant city ship High Charity arrived from slipspace and crashed on the Ark. Debris, spread from the city-ship, heavily damaged Shadow of Intent and helped spread a new Flood infestation on the Ark as a means to stop Truth and to be safe from the Halo activation array. Without any heavy support, John-117 and the Arbiter personally attacked the facility where Truth was to activate the Halo installations.
Sergeant Major Johnson, who had disappeared during the assault on the towers, was in fact captured by Truth's forces and was being tortured into pressing the final switch to activate the other Halos, as fail-safes within the structure prevented anyone other than a Forerunner or a Reclaimer to do so. With John-117 and the Arbiter too far away to stop Truth, Commander Keyes grabbed a Pelican dropship and crashed into the facility to rescue Johnson, but was killed soon thereafter by Truth himself. The Gravemind dispatched Flood forces to assist John-117 and the Arbiter in order to prevent the activation of the Halo Array system; their support enabled John-117 and the Arbiter to reach Truth in time. The Arbiter personally killed Truth with his sword. However, the Gravemind betrayed the two of them after knocking them out of Keyes' Pelican (then piloted by Johnson and also carrying the Commander's body), thwarting their plan of escape and forcing John-117 and the Arbiter to fight their way outside.
343 Guilty Spark, John-117 and the Arbiter learned that the Ark's Forge had created a replacement for the destroyed Installation 04. Realizing that they could use it to fire a tactical pulse which would eliminate the Flood infestation, they decided to light it. However, this new Halo lacked an Activation Index. The only way they could get another Index was to rescue Cortana from High Charity since she still possessed the Index from Installation 04. John-117 and the Arbiter successfully entered the ruins of High Charity and recovered Cortana, using a partly-damaged Pelican to escape while High Charity was destroyed.
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