Corrin was a planet that orbited the Sigma Draconis.
Prior to its devastation by atomics, Corrin was a radiation-prone world, due to the red giant status of its star. It was barely habitable to humans, but became a favored location for thinking machines after the rise of Omnius. Indeed, after Earth was reduced to a radioactive husk by the League of Nobles, Corrin became the new location of Omnius Prime. Corrin had long seasons, because its orbit was so far around the giant sun. Winters and summers each lasted for thousands of days.
Role During the Jihad
As a result of the Great Purge Omnius was confined to the planet for several decades, during which time the planet was mined of all its natural resources and was wrung dry. The robotic reinforcements had been depleted over time.