We have labored for years to build it, and it is magnificent indeed. Miles wide and literally radiating dark energy, it is the most powerful mass effect weapon we've ever built.
Over a hundred times more powerful than the main gun of the Ikora, a monstrous dreadnought of unrivaled power - or at least that had been the general consensus before the Demons arrived and made it look like a rusty centuries old frigate by comparison. Reports suggest it lasted less than two minutes before being ripped to shreds.
It really is too bad we'll only be able to fire it once, not that more than one shot will be required. The resulting backlash of dark energy from the gun once it's fired will render our planet uninhabitable, as the atmosphere will quite literally be devoured by rogue mass effect fields and singularities. Some of our scientists even think the planet might collapse into itself, though this is hotly debated.
This isn't much of an issue, however, because as far as we can tell the rest of our species has already been exterminated. There aren't enough of us left to repopulate our now barren worlds, and as if that wasn't bad enough we'll be running out of food in a few months time anyway. Besides, what would be the point of sticking around and dying of something like old age, knowing we're the last of our kind? No, better to go out with a bang. Or in this case a really, really big bang.
The gun is both a symbol of our defiance in the face of our species' extinction, and a last ditch effort to give the proverbial middle finger to our destroyers. It really is too bad they don't have faces, being sentient space ships and all, as the look on their faces when we kill one of them likely would have been priceless. After all, they've destroyed our entire civilization without taking a single casualty up until this point, at least as far as we can tell.
...
A single signal has appeared on our long range sensors, apparently one of the Demons finally took the bait we left in the form of false mass effect field readings. It's a pity there's only one, it might not have time to relay news of our glorious victory to its fellow Demons.
The gun has been fired. We have triumphed. The Demon is now missing a large chunk of its hull, and appears to be floating in space without power. The atmosphere is ripping itself apart as I speak, but it doesn't matter. We have triumphed.
Our species dies here, but perhaps one day another organic race will manage to end the cycle, after all, anything is possible.
Writer's notes;
In Mass Effect 2, the Reaper you board to acquire the IFF from was apparently disabled by a huge mass effect weapon on the nearby planet. The Illusive Man speculated that it could have been the last act of defiance of a species being wiped out millions of years ago(that's how old the wreckage of the gun/reaper was). I thought it was an interesting concept to write a tiny story about.
This is the first fictional story I've ever written. Constructive criticism/praise/etc. is very appreciated. Sorry if it's boring, first attempt and all that.