@Roboson:
It's complicated.
Both sides have gone magitech. Arstotzka more-so. We both developed artillery. Arstotzka has ~20th century artillery powered using magic while Moskurg has railguns (which are okay) and ballistae (which we obsoleted with our artillery). Both sides have an airforce - we have a combat transport craft, a gunship/fighter, and now a lame bomber. Moskurg has airships and flying canoes(?) using primitive jet engines. While Arstotzka powers our aircraft via continuous controlled explosions.
We also have guns.
Moskurg started winning due to destroying us in the air game, airborne artillery, and using their weather magic to decrease the range of our artillery. Eventually we matched them in the air game (though the exact status of that is currently disputed), and for reasons largely unknown to me they're still advancing.
@FallacyofUrist: I'm okay with a new name if the prefix is one syllable. "Rocket" is two syllables, which makes it unacceptable.
Also, possible revision. The contingency plan. If anyone has a better idea to create supernatural cold, please do submit it.
Revision: Aetherfrost
The Frost Tower. An artifact of older times. Numerous are even visible from Arstotzka city itself. But they lie dormant, rendered useless by Moskurger armor. Climate-controlled armor immune to temperature.
But since then we have improved so much. We can harness our knowledge of magic to once again weaponize these towers. Magineers will be sent to the local Arstotzkan towers to re-activate them with modern technology and improvements, making them useful once again.
Aetherfrost is the result of combining our knowledge of the Aether with our knowledge of the cold. By using the same technique that Aethergems use to connect to the pervasive Aether, we can infuse the entire area with cold. No amount of armor or insulation, however climate-controlled it is, will save them. The circuits in the Towers shall be worked on with this technique, making the Towers of Frost into Towers of Aetherfrost.
Aetherfrost will likely affect us as well. We will lose men to the cold, yes. But Arstotzkans are more naturally resistant to the cold than Moskurgers, giving us the edge. Furthermore, we hope that as Aethergems work by drawing power from the Aether, Aetherfrost's effects are diminished near Aethergems and thus our forces should hopefully receive a much lesser version of Aetherfrost. But ultimately, this is nothing but a hope.
TL;DR: Use our knowledge of the Aether, combine it with our extensive Frost Tower/cold magic experience to make the Frost Towers spread a supernatural "Aetherfrost" instead of just decreasing the temperature regularly. Aetherfrost, being supernatural, should bypass any kind of insulation/temperature-control/etc.. Arstotzkans will likely be affected to, but their natural resistance to frost should help and hopefully Aethergems, taking power from the Aether, should reduce the local effect of Aetherfrost.