Mardin

Mardin is an underground cave labyrinth northwest of St. Louis, within which the lair of the Beastlords was located. The Beastlords possessed an inherent telepathic suggestion which allowed them to control animals. It was acquired through prolonged exposure to an unknown radiation present within Mardin's underground caves. According to the Brotherhood scribes, that this unique mutation only manifests in humans that have been exposed for at least twenty years.

Around 2197, an Eastern Brotherhood of Steel squad was sent to Mardin and eliminated the Beastlords.