The Vulcan Cannon is the default weapon in many titles of the Raiden series. It is a standard laser cannon, a common element in many shoot 'em ups. First appearing in the original Raiden, the cannon has since appeared in a majority of the overall series' titles as well as all of the main series' titles. When the player loses a life in any of the main series' games, their primary weapon will always reset back to the Vulcan Cannon.
The Vulcan Cannon takes on the appearance of small, orange, bullet-like rounds that fire from the nose of the player's controlled starfighter. Despite their small size, the Raiden Supersonic Attack Fighter and the Raiden mk-II are capable of unleashing an endless wave of bullets, which can be devastating amongst clustered enemies and very useful for finding hidden secrets.
Initially, the weapon will start out as a simple two column line of bullets that travel straightforward and deal minimal damage against most enemies and bosses, but upon collecting red beacons, the spread and firepower of the bullets will increase, thus increasing the effectiveness of the weapon. Upon being fully upgraded, the Vulcan Cannon will unleash a total of 10 individual columns when fired, 4 straightforward lines and two lines of 3 columns angled to fire to the left and right respectfully, allowing for most enemies to receive incoming damage from the said weapon.
While the wide spread of the bullets is the main advantage of this weapon, the Vulcan Cannon, even when fully upgraded, cannot reach enemies slightly transitioned to either the left or the right of the main stream of cannon fire. As mentioned before, the damage output of the bullets individually is not very impressive, requiring several rounds of bullets to destroy even enemies with moderate durability. This negative feature however can be countered as the player continues to collect red beacons to help upgrade the weapon and increase the overall damage output.
If the Vulcan Cannon is collected while using a different primary weapon, it will level out to the exact level of the previous used weapon (for example, if the player has the Ion Laser equipped and has collect only a single beacon upgrade, should they collect the Vulcan Cannon, it will be equipped as though it has been upgraded once as well.