##A rapidly-deployable Dyson sphere

Are those aliens on Omicron Persei 8 causing you grief? What better way to permanently deal with the problem than by *literally stealing their star*? Simply deploy a Dyson sphere around their solar system's star(s), and watch as their planet freezes!

As a bonus, you get all the energy produced by the star(s) you just wrapped up, which can be used to create more Dyson spheres and power star-system-destroying superweapons. Soon, the entire galaxy will be under your command!