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The Cool Ship needs an equally cool weapon. If it's a sufficiently humongous Cool Ship, it will be equipped with a Laser Beam on steroids: the Wave Motion Gun — an enormous Ray Gun that fires a massive energy beam capable of blowing away an enemy ship (in the "blow a battleship in half" sense), sometimes an entire fleet, with one shot, and maybe even blowing up an entire planet. Sometimes, it doesn't necessarily have to hit. If you're too close, the sheer energy bleeding off from the beam can be deadly. And don't think about trying to ward it off with Deflector Shields.

Frequently, the Wave Motion Gun is made of Lost Technology, or is an experimental prototype, but sometimes they're a dime a dozen. It also explains how a small fleet can win consistently against enemies that grossly outnumber them: the defense units just have to hold their ground until the Gun(s) is ready to fire. Invariably, just before firing, The Captain has to order the attack.

This sort of weapon could also qualify as a Kill Sat, or a BFG if it is held or installed in a Humongous Mecha. If it's built into a famous real-world location, then it's a Weaponized Landmark. If the bad guys have one, it's a Death Ray. Wave Motion Guns usually require a significant charging period before firing and re-charging/cooldown afterwards (occasionally depicted by Sucking In Lines. The Wave Motion Tuning Fork is a popular subtrope used for visual effect.) Can lead to Wave Motion Fun.

Wave Motion Sword is the sword counterpart to this trope.

Named after the gun of the same name in Space Battleship Yamato.

The reason why you should use it? For Massive Damage See also Kamehame Hadoken, There Is No Kill Like Overkill, Kill Sat, BFB.

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Sword BeamRanged Energy Attack TropesDeath Ray
There Is No Kill Like OverkillFor Massive DamageWhen All You Have Is A Hammer
BFGBigger Is BetterBFS
Units Not To ScaleReal Time StrategyYou Require More Vespene Gas
Laser BladeWeapons And Wielding TropesWave Motion Tuning Fork
Waterfall PukeAnime TropesWeak But Skilled
Laser BladeSpeculative Fiction TropesEscape Pod