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Message: <blockquote data-quote="Pbartender" data-source="post: 2169458" data-attributes="member: 7533">I'd stick to the simple, straightforward asteroidal impact or massive nuclear strike.Even without an atmosphere, the planet itself will transmit the vibrations of a large enough impact or explosion globally.  With a big enough asteroid, global earthquakes and the resulting possible vulcanism alone would devastate the world.Another option might be to place one or more high-powered and deeply penetrating radiation sources into orbit over the planet.  Kill off all the life on a planet without harming any of the structures...  Creepy for whoever runs across the remains.Here's another thought.  What if the berserkers aren't actually war machines, but mobile automated terraforming facilities.  Their purpose is to create planetary paradises for a long, lost race of alien who had very different biological requirements than any currently known intelligent species.  It doesn't matter to the berserkers whether a planet is already inhabited, they just begin terraforming, destroying the planet's current ecology and population in the process, with the final result being totally inhospitable to humans.  At first, the attacks may seem random, but a pattern of planetary requirements (gravity, orbital distance, etc...) may become evident.  Colonists could be evacuated from planets most likely to be 'attacked'.I'd take a look at Spycraft gadgets, if you can get acess to any of the game's books, or look through the free D20 Future SRD  (you can find it on the Wizard's website).  Both have examples, rules, and options for building gizmos similar to what your thinking of.</blockquote>

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