Ultima Cannon

Ultima Cannon (アルテマキャノン) is a technique Kingdom Hearts Birth by Sleep. Despite this technique being exclusive to Terra, Terra-Xehanort and the Lingering Will can use this attack as well, as they are extensions of Terra. The attack consists of the user transforming their Keyblade into a large cannon, which launches two large balls of energy at the opponent.

Mechanics
In Kingdom Hearts II Final Mix, the Lingering Will's version only fires one ball of energy, though the blast is larger than the Kingdom Hearts Birth By Sleep version, and it homes in on its target.

In Kingdom Hearts Birth by Sleep, Ultima Cannon is Terra's ultimate Shotlock. After the first ball of energy is fired, the player can increase the damage of the second ball by pressing when prompted. The better the player times their button press, the more powerful the second energy ball is.

Kingdom Hearts Birth by Sleep

 * Terra can obtain Ultima Cannon by completing the Keepers of the Arena mission at the Mirage Arena.