Installation 00 Citadel

From Halopedia, the Halo wiki

The Citadel[1] was a Forerunner supraluminal communicator[2] building.

Introduction

It was located on one of the seven peripheral spokes of Installation 00, and was a location from which one could remotely activate all of the Halo Installations. The Citadel was defended by three shield-projecting Barrier Towers that had to be disengaged before it could be accessed.

Battle of Installation 00

During the Battle of Installation 00 in late 2552, the Prophet of Truth landed upon Installation 00 on the Forerunner Ship, and seized the Citadel while the majority of his fleet and armies distracted the persuing United Nations Space Command/Covenant Seperatists allied forces. However, Ship Master Rtas 'Vadum "laid waste" to the Prophet of Truth's aerial fleet and SPARTAN-117 and the Arbiter led a Marine and Sangheili ground attack on the Ark's surface, pushing forth to the Brute-held Citadel. However, the Prophet of Truth activated the Barrier Towers, forcing the UNSC and the Elites to send strike teams to lower the Barrier Towers before gaining access to the Citadel.

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