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Converging-Stream Weapon

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This is a heavy weapon which contains multiple smaller devices that send out a stream, beam, blast, etc.. Those all converge into a single stream, beam, blast, etc., that is more powerful than the sum of its parts.

Usually, the resulting stream goes in the logical direction—that is, in the direction produced by taking the average of the directions of the intersecting beams (although more advanced versions are able to swivel in any direction).

Besides Rule of Cool, this kind of weapon has loose grounding in reality. If multiple lasers are fired at the same point so that they intersect there, they simply pass through one another and continue on their respective trajectories. You can try this at home with some laser pointers.

The inversion of this trope, where one attack splits into many, is Recursive Ammo or Spread Shot.

Compare All Your Powers Combined, Roboteching, Wave-Motion Gun. Not to be confused with Crossing The Streams.


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    Anime & Manga 

    Films — Animation 
  • The device at the top of the Ziggurath in Metropolis (2001) used to create black spots on the Sun is a variation of this. It works with several emitters aligned so their beams form a plasmatic orb which is then accelerated by a propulsory device in the middle.
  • For the climax of My Little Pony: Equestria Girls Forgotten Friendship, after the magical-girls transformations, the geode pendants each shoot a ray that converge into a single beam and blast the Memory Stone, shattering it.

    Films — Live-Action 

    Live-Action TV 
  • Babylon 5:
    • Vorlon ships had several booms on the front of the ship that each emitted a lightning bolt-like beam. They met in the middle to create a Wave-Motion Tuning Fork effect.
    • The Interstellar Alliance's Victory-class destroyers (which were based in part on stolen Vorlon technology) used beams sent from the three wingtips to the front to convert the entire ship into a massive Wave-Motion Gun.
  • Doctor Who:
  • The basic enemy fighter ship in Kara no Messeji: Ginga Taisen (also known as San Ku Kaï or Sankuokai) have six forward-facing arms that open when they take flight (making them look a bit like spiders). Lightning-like beams are emitted from each tip and converge in the middle in a single ray. When seen from the cockpit, it looks like the beams are converging exactly on the target.
  • Lexx: The titular starship is armed with a Wave-Motion Gun powerful enough to tear a planet apart. The Lexx is also a Bio Punk Living Ship shaped like a giant insect. As it prepares to fire, sparks of energy pour out of every facet of its bulbous compound eyes. The energy streams and converges to a point near The Lexx's mouth, then blasts forward.
  • Several Power Rangers weapons work by this, the first being the original Rangers' Power Cannon from season two (one barrel fires five energy balls... that turn into one much more Badass one).
  • The Eye of Ra (the Wave-Motion Gun Anubis uses against Abydos) in Stargate SG-1 is one of these. This makes sense, since the entire episode ("Full Circle") is a huge Shout-Out to/Affectionate Parody of Star Wars (particularly A New Hope), with Lampshade Hanging aplenty.
  • Star Trek:

    Video Games 
  • Command & Conquer:
    • The Ion Cannon from latter games in the Command & Conquer: Tiberian Series works in this manner. Unfortunately, this telegraphs the actual attack, enabling your enemy to sell all buildings in the target zone before the main blast occurs.
    • Multiple Beam Cannon units from Command & Conquer: Tiberium Wars will sometimes do this.
    • In Command & Conquer: Red Alert 3, the Athena bombardment vehicle features converging beams on its gun. Unusually, they emerge from the same point on the Athena and "sweep" towards to the target from the left, right, and top. Also, they're the targeting lasers — once they converge, the real weapon shoots down from orbit.
  • Xenosaga Episode I had the Rhine Maiden, a converging wave-motion gun comprising the Dammerung and four smaller vessels in formation.
  • Terraria has the Last Prism, an endgame weapon. It's the highest DPS magic weapon in the game.
  • StarCraft II's Void Ray is a new Protoss ship built by the Dark Templar which serves this purpose. The number of beams that converge actually increases over time, letting it be a much better weapon against targets that take a while to kill (though it's still damn good against infantry). It should be noted that the Void ray uses a focusing crystal to do this.
    • In the original game, the warm-up graphic for the Battlecruiser's Yamato Cannon was this, several orange globs of energy converging into a single blob. The Yamato is supposed to be the result of causing a nuclear explosion inside a magnetic containment field, then giving a single way out.
  • Wing Commander Prophecy was supposed to have the Tiamat dreadnought equipped with a version of the "fleet killer" plasma gun mounted in the Kraken, with the green glowing tips of the Tiamat's arms forming the beam, but technical difficulties prevented it from being implemented.
  • Bang: Gunship Elite has many weapons, one of which fires rapidfire bolts from the meeting point of three continuous beams that emanate from three prongs in front of the ship.
  • This looks to have been averted in FreeSpace 2 with the Sathanas dreadnought, which has four massive frontal arms, each with its own beam cannon. Until the end, when they're brought together to form a sort of wibbly wobbly Swirly Energy Thingy between the arms. Vassago's Dirge, a game mod, shows the titular Ravana destroyer doing this however.
  • Many of the Polaris vessels in Escape Velocity Nova (most notably the Arachnid and Raven) do this with their pink CPL (Capacitor Pulse Laser).
  • Star Trek: Armada 2 has the Species 8472 weapon mentioned above. It's severely Awesome, but Impractical, given that it needs one specialized ship and eight others, plus the necessary research, but it can depopulate a planet or destroy most any ship if you can land a hit.
  • In the Magical Girl Lyrical Nanoha A's Portable games, Hayate's Ragnarok is portrayed like this. The three beams that fire from the points of the Belkan Traingle spiral towards one another and converge into one larger beam that strike the target, then Hayate triggers the last part of the spell to make the resulting beam even bigger.
  • Homeworld's largest type of Wave-Motion Gun, the Phased Cannon Array (as well as its bigger brother, the Sajuuk Main Gun), possibly works this way: it is seen firing a number of normal-power ion beams from the dozen muzzles in its bow, which quickly combine into a single, insanely powerful blast.
  • The narrative trailer of Battlefleet Gothic: Armada shows what looks like three Blackstone Fortresses combining their attacks for an apparent class X2 Apocalypse in a manner very similar to either the Death Star or Species 8472.
  • Warframe: Laser weapons, such as the Phage, work this way. They're generally considered more trouble than they're worth.
  • The Legend of Zelda: Breath of the Wild: When the Divine Beasts fire at Calamity Ganon, their beams converge on the upper floor of Hyrule Castle before descending on Ganon.
  • Cosmoteer lets you converge Ion Beams into a more powerful one by directing them at Ion Beam Prism, for a small damage penalty. The combined beam can then be converged with others the same way, but the penalty is bigger the more the two beams differ in power. It is also possible to hypercharge a beam by converging it with itself in a loop, and then releasing it all at once as a powerful Charged Attack.
  • The various races' "Death Ray" modules in Battlevoid: Harbinger function this way: multiple smaller beams emanate from emitters in the weapon mount that combine into a single powerful beam of energy.

    Western Animation 
  • Though a case of All Your Powers Combined, not this, Captain Planet's summoning looks a lot like doing this with The Power of Friendship.
  • In an episode of Johnny Test, Susan and Mary build a trio of robot boys that go berserk and try to kill Gil out of jealousy. To get the job done, they steal Johnny and Dukey's new water guns (which Susan and Mary also built) and modify them to fire this way, making them powerful enough to cut through solid matter.
  • My Little Pony: Friendship Is Magic:
    • Princess Celestia using the Elements of Harmony on her own to banish Nightmare Moon in "Princess Twilight Sparkle" is presented this way, with the other five Elements channeling their power into the Element of Magic for a massive beam.
    • In "Twilight's Kingdom - Part 2", the Mane Six's new friendship-powered Wave-Motion Gun manifests this way, blasting Tirek with six individual beams of light before they combine into one powerful blow that defeats him, takes back the stolen magic, locks him back in Tartarus, and releases Celestia, Luna, and Cadence from Tartarus when their own magic is restored.
  • In the SpongeBob SquarePants episode "The Krusty Plate", faced with a ridiculously stubborn spot on a plate, SpongeBob resorts to using a cannon that combines a particle beam with a water cannon and a laser within a bundle of steel wool. He gets the spot off, only to destroy the Krusty Krab in the process.
  • Star Wars Rebels: "Wings of the Master" shows the prototype B-wing's main weapon working like this.

    Real Life 
  • Lasers sometimes have multiple sources, then focus them all together into one coherent beam on exit (particularly ones that are supposed to be stupidly powerful, but where mobility is not a concern, like in laboratories). This is also the logic behind a phased array, we just can't do it with lasers... yet.
  • An 'implosion bomb' uses multiple smaller explosions to set off the main charge. For the uninitiated, this is the most popular form of nuclear device.
  • Some radiotherapy devices used for treatment of highly localized brain tumors operate on this principle. The method is called "gamma knife radiotherapy". Basically, they send several hundred (usually over 200) narrow gamma ray beams into your head. Each beam is fairly weak and doesn't do much damage on its own, but they all intersect where the tumor is located.
  • Though not a weapon, this is how inertial confinement fusion reactors are supposed to work - with hundreds of laser beams converging on a tiny spherical pellet of fuel, causing it to implode and ignite a fusion reaction.