Dark Cannon (ダークカノン, Dāku Kanon?) is a recurring ability in the series. It is a trademark attack of Cecil Harvey while as a Dark Knight, but sometimes appears as a special ability used by other classes.
Dissidia Dark Cannon is a ground physical Bravery attack while in Dark Knight form, initially learned at the start of the game. It costs 20 CP to equip (10 when mastered), requires 180 AP to master, has Melee Low priority, and has Magic Block effect.
Dissidia012 Dark Cannon returns as a Bravery attack for Cecil, now requiring 180 AP to master, and now has Ranged Low priority on the initial fire and Ranged High priority on the return fire.
Consume caster's HP to damage all enemies
Dark Cannon is an ability exclusive to Dark Knight Cecil, who learns it upon reaching Level 76 (5★). It deals dark physical damage (2.5x) to all enemies, and while it costs 0 MP to cast, it requires that Cecil sacrifice 40% of his HP to execute it.