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Reth was one of the Kig-yar rebels who settled on the Rubble with Human refugees. He was the leader of the Kig-yar forces at The Rubble, and bred an army of Unggoy on the surface of a planet in the same system, Metisette.[1] His alliance with the Insurrectionists was merely a ruse by which he intended to acquire the location of Earth, before wiping them out with his army. While they were believed to be rebels by both the humans and Covenant forces sent by the High Prophet of Regret, Reth was actually acting under the orders of the High Prophet of Truth, who had no faith in Regret's methods. Reth believed that in completing his mission, he would earn the Kig-yar their place at the Prophets' side. The Unggoy who served under Reth and his Kig-yar also believed they were rebels. They followed Reth because he had promised to give them Metisette, which had an abundance of methane.
When he was believed to be a rebel, Thel 'Vadam (then Thel 'Vadamee), Zhar, Saal, and Veer kidnapped him from the Redoubt for information. They then tortured him, refusing to believe that he was following the orders of the Hierarchs since they were under conflicting orders. Reth escaped imprisonment by fooling his Unggoy guards into releasing him. When he learned that Peter Bonifacio had lost Earth's nav data, he prepared to launch a massive assault on the Rubble and the Exodus asteroid. However, he was killed when the Rubble crashed into the Redoubt on Metisette.