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A Monitor is a very smart artificial intelligence created by the Forerunners to look after and maintain the Halo Array after they were killed by the Halo effect. Each ring has at least one Monitor, who controls almost every process that occurs on Halo, from the regular upkeep of the world's systems to the containment of the Flood. 343 Guilty Spark and 2401 Penitent Tangent were the only two known Monitors.

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