Fall of Rannoch, also known as the Combine Occupation of Rannoch was an event that occurred after the months long battle between the Combines and the joint forces of the Quarian and Geth where the combines calmed victory and established the planet as a research colony as they begin to experiment with the remaining Quarian and Geth, out of these experimentation,came the creation of Combine-controlled Geth, the Horrid Geth-Quarian Hybrid known as the Resuit Gen (Khelish for "Death's Servant") and the TransQuarian Combine (now apart of the TransRace). The occupation of Rannoch ended after the Citadel Alliance liberated the planet in 1422.

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