Castle Brain Fortresses are fictional structures in the Battletech universe. There was once more than 120 Castle Brians. Most known of a single planet is six on the world of Lambrecht with the average firepower and unit strength of a Castle Brian each one has a minimum of 20 heavily armed turrets carrying an assortment of weapons and missiles. In addition to these fortifications is the passive strength of the fortress itself, which is usually built deep inside a mountain and is virtually impregnable to anything but a full-scale nuclear blast. The purpose of a Castle Brian, not to prevent the invasion and takeover of a Hegemony planet, has always been a failing of strategists to believe that a fortress protects and prevents the surrounding land from being taken over by an enemy. A fortress