- Does not detect infiltrated units like turrets do, but has an extremely long firing range. - It has a minimum firing range, so it is defenceless against close assault enemy squads. - Effective against all types of foot soldiers, with AOE damage. Cannot target Aircraft. - Emplaced heavy artillery railgun cannon, a relic of the Dark Age of Technology from our Adeptus Mechanicus allies! - Each HQ can support the creation of one (1) Grand Cannon. - NOTE: The Grand Cannon does NOT fire by its own - it must be targeted against a specific enemy!