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One of my campaigns was based around the struggle for control of an ancient device of power. Not much was known about it, it's constructors all vanished from the region.
Cue ensuing fights between nations, cultists, and heroes to try and control said device. After a climactic fight in its holding facility the heroes find it.
It looks to be little more than a globe of this world, which in of itself is pretty spectacular because the world had yet to be fully mapped and circumnavigated. A few rings can be swung around the world to where they all have an intersection at one point.
So heroes cautiously test the device, nothing major happening. No earthquakes. No storms. No magic fluxes. The wizard uses what magic she can and determines it is doing something. Not sure what is going on the group decides not to press their luck with the device. Until one of the players convinces them to use the rings and center it on a nation that everyone hates. So they do so, and after some prodding the device glows for a moment and goes dim. Nothing.
They camp at the device's ruins for several days. Testing it out over the course of those days. Nothing happens, and players are beginning to think the device is broken or worthless. Until a messenger approaches screaming about fire from the sky. More messengers eventually arrive from more nations, with similar tales.
Sure enough the sky begins to glow with fire, as great fireballs begin to rain down from the heavens onto the horizon.
And that was how the heroes ravaged the world with the device of summon meteor.