Disclaimer: I claim nothing as my own, well with the exception of a few things however I do not own the World of Warcraft franchise (wish I did).
A small silver object flashed over the dry burning grasslands of the barrens a super sonic velocities, fast and agile it continued following the way points loaded into its guidance computer. It's design was completely alien to the inhabitants passing by below it, only a few even noticed it as it rapidly moved through their field of view. Most, merely simple farmers disreguarded it and continued on with their lives, some stopped and stared as it passed over, none however had anything to interfere with it's task. From it's launch point further south the surface to surface missile had less then five-hundred kilometer distance to fly until it reached it's target, now less then hundred kilometers away. A major population center nestled in the canyons of what was designated grid square ON12 known to it's population as Orgrimmar. It represented the largest gathering of opposision to the Erusean landings far to the south, despite their primitive means the inhabitants unusual extra-human capabilities had proven a hazard to even advanced combat systems. As a result of these costly encounters the ground commander for operations chose a less... civilized operations method, one which had already demonstrated success on the planet's other continents.
The weapon banked upward as it passed over the city's bulwarks executing a preprogramed 'pop up' manuever bringing it several hundred meters over the city's center, many looked up as the sonic boom washed over the area... for most it would be the last thing they witnessed in this realm.
The sky flashed white with a brilliance greater than the sun, instantly blinding those looking directly at the hypocenter. Tens of thousands flashed into vapor as the temperature reached over one million degrees, some would leave their shadows burned into stone. A lasting monument to their existence in this world, others farther away or partially shield would carbonize in the intense heat leaving charcoal like remains. The unlucky however would find themselves in an environment similar to interpretations of hell. The effects of the weapon would be further amplified in the canyons the city was built in, concentrating the thermal and blast waves into lethal torrents obliterating all life. Surviving inhabitants, mostly deaf, burned, or blind began to cry out for help as the signature mushroom cloud began to rise over the hell scape.
Far to the south the beings responsible for this act began to move north.
AN: A little prelude I wrote to get this idea in motion, I've always been fascinated by the odd technology level present in the Warcraft canon. This is basically a technology vs. fantasy situation (with a little steam punk thrown in for good measure, I mean you can't ignore the gnomes right?). To sum it up Azeroth is now under a large scale orbit to surface invasion from human space going faction, I'll probably enjoy writing this.