Create-a-superweapon

[Blade Knight]

I was daydreaming recently about ideas for some kind of epic superweapon, and I got to wondering if anyone here can come up with one. Giant tanks, gun systems, laser swords, mechs... whatever you can think of that would be awsome.
Be creative and detailed. This is just for fun, so you don't have to be too serious about it (but if you do, that's fine too!).

[E-Stalin [Orthrus]]

A small, ten pound, portable rail gun that is somehow magically powered by impossibly efficient fuel cells and can cool itself down between shots in mere seconds and propels a 50 gram armor piercing bullet over three miles away with sub .3 MOA and is loaded by 10 round disposable magazines and is fully compatible with picatinny rail accessories and is made by H&K.

Sweeeet....

Actually my own superweapon is right in my roleplaying characters profile. The AV-21, one sweet hypersonic attack shuttle that can somehow be flown at the speed of sound, acts like a mix between an air superiority fighter, a bomber, and an airlift, has armor that normally goes on a main battle tank, carries a quantum computer, a nuclear reactor, and an array of sensors scanning everything from microwaves to gamma rays.

Sweeeet.

[Still Churchill]

The death ray. Strap a minorly modified microwave oven to your chest with a button placed on the side and watch those in front of you get decimated with a highly compressed death ray!

[CSM-T-101]

A machine gun with mounted grenade launcher that fires a leech like creature that upon contact infects enemy with a virus that breaks down the internal organ system. The rounds for the machine gun are acid tipped.

Second weapon, A shot gun that is fully automatic and fires flammable shot gun shells. Mounted assorted knives also.

[Aseigan Cetanu]

A small, hand held device that sends out signals to various specially-designed satellites in the atmosphere that, when controlled manually by this device, manipulate the wind currents and moisture levels by some type of emission that subtly changes things to the perfect rate and amount, so that you can cause precision natural disasters. Make lightning strike a building five to six times in a row, touch a tornado down on a single person, cause a class five hurricane to form inches from New York City, possibly even have some kind of sonic device on the satellites that interferes with the geologic structure of the ground so that you can cause tidal waves, volcanic eruptions, earthquakes. Very, very powerful, and fun on top of it all. Gives me that fluttery, mad-scientist feeling in my stomach. ;D

[Setg]

An idea I had for an Anita Blake fanfic (that I never actually completed) was a test-phase weapon that Edward had, a gas powered pump-action napalm launcher. Roughly the same size as a shotgun, the round would be a spherical plastic housing that contained an amount of napalm and an oxygen reacting fuse, that would ignite the napalm on contact and turn the vamps into crispy critters.