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The inusannon were a spacefaring race that existed at least 127,000 years ago. Little is known about them except that they warred with another race, the thoi'han, over colonization rights to the garden world Eingana, and that they inhabited Ilos at some point. The inusannon were eventually wiped out by the Reapers. Tens of thousands of years later, the ruins of inusannon civilization provided the Protheans with the knowledge necessary to develop mass effect technology.