The Yamato cannon (a.k.a. Yamato gun) is a fearedterran particle weapon.
By the Great War, recent research had led to the development of the weapon. It uses an intense magnetic field to focus a small nuclear explosion into a cohesive beam of energy. The cannon requires a huge energy reserve to fire, but the effects make it worthwhile. In 2499, terran engineers were working overtime to retrofit existing battlecruisers with the weapon. Behemoth-class battlecruisers received such retrofits. The cannon was suitable for "scorched earth" work.
In both StarCraft and StarCraft II, the Yamato cannon's range of ten makes it an effective siege weapon, able to destroy stationary defenses and anti-air units out of their range, leaving the battlecruiser safe. However, it takes a few seconds to charge before firing once a target is acquired. Only the strongest units can survive a shot from a Yamato cannon. The Yamato cannon is best used to eliminate strong anti-air defenders, such as enemy battlecruisers, carriers, and void rays.
Analogous to StarCraft's "Yamato Gun". Adds a large central gun to the bow. Prior to firing, the "head" splits apart, and the 'neck' recoils when the weapon is fired. Does 300 damage to any target they hit.