Rangda

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Psychic brain-eating Fox People who nearly destroyed the Imperium at one point, now extinct. Had the capability of one individual mentally enslaving nearly a planet's worth of humans, and making use of genetically engineered warbeasts. Next to nothing is known about what happened during the war, due to the information purge involving the Lost Primarchs.

For more information, check out the page on the Rangdan Xenocides.