Saragorn Enclave

The Saragorn Enclave was a polity on Terra during the Age of Strife known for their psy-breeding experiments. During the Unification Wars, the Enclave surrendered to the forces of the Emperor but still carried on the experiments in secret. When the Emperor discovered this defiance, he dispatched the VIIIth Astartes Legion (later known as the Night Lords) to bring his retribution. The Enclave was viciously destroyed.^[1]

Sources

• 1: The Horus Heresy Book Two - Massacre pg. 92