Sentinel manufacturing facility

Sentinel constructor factories are facilities that manufacture various types of Forerunner automatons, such as Sentinels, Sentinel Majors and Enforcers, or in case of Onyx, Onyx Sentinels. The appearances and sizes of these facilities vary greatly depending on their location.

Overview
There are several varieties of Sentinel factory. The most commonly seen are massive, floating structures that hover above battlefields in an attempt to keep them somewhat safe from the majority of Flood if there is ever a major outbreak. These facilities were used during the Flood outbreak on Installation 05, and could be seen in the sky above the Quarantine Zone around the Installation's Library. One of these facilities was destroyed by plasma mortar shots (possibly fired from a Flood captured Wraith to slow down the Forerunner defenses) during the Battle of the Quarantine Zone on Installation 05.

Onyx contained a massive Sentinel factory located underneath its north pole, which produced the huge number of specialized Onyx Sentinels that made up the artificial planet's superstructure. The facility was so large that the arc of the planet's curve could be seen in the distance. Clouds of Onyx Sentinels hovered over the construction facility. The Sentinels in this facility were constructed out of molten ore spewed from a massive machine, which cascaded into a hollow tower. From the bottom of this tower tumbled millions of Sentinel components, which then were ferried to another part of the factory by energy beams. As they traveled, they assembled themselves into the three-meter long "booms" of the Onyx Sentinels. In the center room, there was a pyramid-shaped structure described as being "five times the height of the Great Pyramid of Giza", which was composed of the "eye" spheres of the Sentinels. Every six seconds a sphere from the apex of the pyramid ascended in a shaft of silver light. When the spheres emerged, they had been assembled into a complete Onyx Sentinel. This facility produced a new Sentinel every six seconds, quickly making enough Sentinels to combat any known threat. It was later destroyed by SPARTAN-IIs and IIIs to halt the production of Sentinels on Onyx.

Another Shield World-type installation discovered by the crew of the had several types of underground Sentinel factories, which created standard Sentinels, Super Sentinels and Protectors.

Appearances

 * Halo 2
 * Halo: Ghosts of Onyx
 * Halo Wars